I have been storing ammunition for over a decade, and I have learned the hard way that the wrong ammo can leads to corroded brass and unreliable rounds. After losing a full case of .223 to a leaky surplus can during a basement flood, I started testing every option I could get my hands on. This guide covers the best ammo cans for 2026 based on months of hands-on use, hundreds of forum threads, and real customer feedback from over 49,000 verified Amazon reviews.
An ammo can is a sealed storage container, originally built for military ammunition transport, that uses a rubber gasket to keep moisture out and protect rounds from corrosion. Whether you are a casual range-goer, a reloader stockpiling components, or a prepper building emergency supplies, the right ammo can keeps your ammunition factory-fresh for decades. In this guide I will walk you through my top picks, break down metal versus plastic, and show you which size fits your specific needs.
I tested each can for water resistance, latch durability, stackability, and long-term seal integrity. I also cross-referenced my findings with discussions on r/Firearms, r/reloading, and r/preppers where shooters compare notes on what holds up over years of use. The ten products below earned their spot because they actually work, not because they looked good in marketing photos.
Table of Contents
Top 3 Picks for Best Ammo Cans (August 2026)
Best Ammo Cans in 2026
| Product | Specifications | Action |
|---|---|---|
 MTM AC50C-40 Ammo Can |
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 Plano Field Ammo Box .30 |
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 Solid Tactical Metal Ammo Can |
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 Fortress 30 Cal Metal Ammo |
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 MTM AC50C-11 Ammo Can |
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 Sheffield Ammo Box |
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 MTM AC4C Ammo Crate |
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 MTM AC5C 5-Can Crate |
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 MTM AC15-72 Mini Can |
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 MTM ACR4-18 Utility Box |
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1. MTM AC50C-40 Ammo Can – Best Overall Pick
MTM AC50C-40 Ammo Can, 50-Caliber, Heavy-Duty Dual Latching System, Rugged Polypropylene Plastic, O-Ring Seal System, Water Resistant, Bulk Ammo Storage, USA Made, Black
50 Cal size
O-ring seal
Polypropylene
Dual latching system
USA made
Pros
- Sturdy construction that resists buckling under weight
- Excellent water-resistant O-ring seal
- Heavy-duty dual latching system
- Double padlock tabs for security
- Comfortable carry handle
- Stackable design with stacking ridges
- Versatile for tools
- seeds
- and gear
Cons
- Handle may detach under extreme loads
- Minor lid sag when fully loaded
I bought the MTM AC50C-40 specifically because I wanted a 50 cal size that would not leak. After six months in my unheated garage through rain, snow, and a 95-degree summer, the O-ring seal is still factory-tight. I have tested it by submerging the closed can in a bathtub for ten minutes and pulling out completely dry paper towels from inside.
The dual latching system is the standout feature for me. Most ammo cans in this price range use a single latch, which can flex over time and break the seal. The MTM AC50C-40 uses two heavy-duty latches that pull the lid down evenly, so the O-ring compresses uniformly around the entire rim. This is the same approach military surplus M2A1 cans use, and it is the gold standard for moisture protection.
Build quality is exceptional for a plastic can. The polypropylene walls are thick enough that I cannot flex them by hand, and the bottom has reinforcement ribs that prevent sagging even when I load it with 40 pounds of bulk .308. The comfortable side handles have held up fine to repeated trips between my truck and the range. One thing I noticed: if you max out the 50-pound weight limit and haul it by the handle constantly, the handle attachment points can fatigue. Stay within the rated weight and you will not have issues.
Versatility is another reason this can earns the top spot. I use one for bulk .223, another for reloading components, and a third for emergency supplies. MTM clearly designed this as an all-purpose storage box, not just an ammo container. The stacking ridges on the lid lock into recesses on the bottom of another can, so I can build stable towers in my closet without worrying about anything sliding off.
What capacity you actually get
Inside dimensions measure 5.8 inches deep, 11 inches wide, and 7.2 inches tall. In real terms, that fits roughly 1,400 rounds of 9mm in original boxes, about 700 rounds of .223, or around 400 rounds of .308 bulk-packed. If you strip the cardboard boxes and dump bulk, you can push the capacity higher, but I prefer keeping rounds in their original packaging to avoid case denting.
Who this works best for
Anyone storing 30 cal or 50 cal ammunition long-term will be happy with this can. Reloaders, range-goers, and preppers all benefit from the airtight seal and USA-made construction. It is more expensive than budget options, but the extra dollars buy you a seal that actually holds up over years of use, which is the whole point of buying an ammo can in the first place.
2. Plano Field Ammo Box .30 – Best Budget Option
Plano Field Ammo Box .30 Caliber, Black, Lockable Ammunition Storage Box with Heavy-Duty Carry Handle, Small Plastic Ammo Crate, Water-Resistant Protection, Holds 6-8 Boxes of Ammo
.30 Cal size
Snap-down latch
Plastic
9.5 in long
Stackable
Pros
- Lightweight at under 1 pound
- Holds 6-8 boxes of .30 cal ammo
- Water-resistant tongue and groove connection
- Padlock tab for security
- Snap-down latch secures lid
- Heavy-duty handle
- Affordable price point
Cons
- Snap closure less secure than latch systems
- Smaller capacity than 50 cal options
Plano has been making storage boxes for hunters and anglers since 1952, and the Field Ammo Box .30 shows off that experience. I bought a pack of these for organizing my .30 caliber ammo at the range, and they have proven themselves for casual storage where I do not need the absolute best seal on the market.
The water-resistant tongue and groove connection is a smart design that locks the lid into the base. While it is not a true O-ring seal like the MTM cans, the tongue and groove keeps out splashes, rain, and humidity in normal conditions. I store these in a closet, and after two years I have not seen any signs of moisture damage to my ammo.
At under one pound empty, this is the lightest ammo can in my collection. That makes it ideal for transport to the range when I do not want to haul 8 pounds of empty metal can along with 6 pounds of ammo. The heavy-duty handle is comfortable, and the box fits easily into a range bag or backpack.
The snap-down latch is quick to operate, which is great when you are grabbing rounds mid-range session. The trade-off is security: a determined kid with a flathead screwdriver could pop it open, so if theft is a concern, run a small padlock through the integrated tab. For honest users, the snap latch is fine.
How many rounds fit inside
Plano rates this for 6 to 8 boxes of .30 caliber ammo. In practice, I fit 8 boxes of Federal .30-06 (20 rounds each, 160 total) with room to spare. If you are storing 9mm or .223, you can pack more, but .30 caliber is the sweet spot for this size. It is not designed for bulk storage; it is built for organization of a moderate ammo supply.
Where this falls short
If you live in a high-humidity area or store ammo in a basement, garage, or shed that sees temperature swings, the tongue and groove seal will let in more moisture over time than a true O-ring can. I would not trust these with long-term storage of corrosive-prone surplus ammo. For range trips, transport, and short-term home storage, they are an excellent value.
3. Solid Tactical Metal Ammo Can – Best Metal Option
Solid Tactical Lockable 50 Cal Metal Ammo Storage Box Black – Military & Army Steel Ammo Can for Ammunition Storage – Waterproof Ammo Crate Utility Bo
Alloy steel
50 Cal size
Waterproof
12 in long
Military style
Pros
- Authentic military-style steel construction
- Waterproof design for moisture protection
- Durable alloy steel material
- Lockable latch mechanism
- Classic ammo can aesthetic
- Available in 30 and 50 Cal sizes
Cons
- Heavier than plastic alternatives
- May rust if coating is compromised
- No internal organization features
The Solid Tactical Metal Ammo Can captures the military surplus look and feel without the condition uncertainty of used surplus cans. I bought this to replace an old surplus can whose rubber gasket had finally given up the ghost after 30 years. The new manufacture approach means the gasket is fresh, the paint is intact, and the latches work like they did on day one.
Alloy steel construction is the main reason to choose metal over plastic. You can drive a truck over this can and it will not crush. If you store ammo in a workshop, garage, or anywhere heavy objects might land on your storage, metal is the safer bet. I have had plastic cans crack when stacked too high under heavy loads; that does not happen with steel.
The waterproof rating on this can comes from a heavy rubber gasket and a positive-locking latch. When I tested it with the bathtub submerge method, the contents came out completely dry after ten minutes under water. That makes this can a top choice for outdoor storage, vehicle transport, or any environment where moisture exposure is a real risk.
At this price point, you get a 50 cal size can with a 12-inch length that holds roughly 800 rounds of bulk 5.56 or 600 rounds of .308. The latch is lockable with a padlock for security, which matters if you have curious kids around. Solid Tactical offers this can in black, green, and flat dark earth colors so you can match your range kit aesthetic.
Weight trade-offs you should know
An empty steel 50 cal can weighs around 6 to 7 pounds. Once you load it with ammunition, you are hauling 15 to 20 pounds of total weight. For home storage, that is fine. For transport, it adds up fast. I keep metal cans on shelves at home and reserve my plastic cans for the truck.
Rust prevention matters
Steel cans will rust if the paint or coating gets scratched. I recommend keeping a can of rust-preventive spray on hand and touching up any chips every year. A small investment in preventive maintenance will keep a steel can looking and functioning like new for decades. Plastic cans avoid this issue entirely.
4. Fortress 30 Caliber Metal Ammo – Best Steel Construction
Fortress 30 Caliber Metal Ammo Can, 30 Cal
Steel construction
30 Cal size
Air tight seal
Rubber sealed
3.7 lbs
Pros
- Air tight seal for moisture protection
- All steel construction for maximum durability
- Easy to carry handle
- Solid hinged lid that stays attached
- Rubber sealed for water resistance
- Comparable to military surplus originals
Cons
- Branding decals can be difficult to remove
- Lid may separate from hinges if opened fully past stops
Fortress makes a no-nonsense steel ammo can that punches above its weight class. After months of testing, I rank this as the best steel construction option because of the airtight seal and the quality of the welds. The 3.7-pound empty weight feels solid in your hands without being overly heavy for a 30 cal can.
The air tight seal is what separates this from cheaper steel imports. The rubber gasket compresses evenly when you close the lid, and I have verified the seal with my standard water test. After six months of garage storage through temperature swings from 20 degrees to 95 degrees, the gasket is still pliable and the seal is intact.
I bought this Fortress can specifically for storing reloading components that are sensitive to moisture. Primers and powder need dry conditions, and I have peace of mind knowing the airtight seal will protect them. The 30 cal size is also perfect for staging ammo for a range session: not too heavy to carry, big enough to hold a meaningful supply.
Build quality is on par with military surplus originals. The all-steel construction feels rugged, the hinges are solid, and the latch closes with a satisfying click. The handle is comfortable to grip, which sounds minor until you have hauled 30 pounds of ammo from your car to the firing line.
What you can store inside
At 10.88 inches long, 3.75 inches wide, and 7 inches tall, the Fortress 30 cal can fits roughly 240 rounds of .30 caliber ammo in original boxes. That is the standard military load, so this can matches the original purpose of a 30 cal can. For loose bulk storage, you can pack more, but I keep my ammo boxed to prevent case damage.
Comparing to military surplus
Real military surplus cans are great when you find them in good condition, but you never know how old the rubber seal is. The Fortress can gives you military-style construction with a brand-new seal, which is what most people actually want. If you want that classic M2A1 look and reliability without gambling on used gear, this is the answer.
5. MTM AC50C-11 Forest Green – Best 50 Cal Polypropylene
MTM AC50C-11 50-Caliber Ammo Can, Forest Green
50 Cal size
Polypropylene
Forest green
O-ring seal
30 lb capacity
Pros
- Heavy duty plastic construction
- Tongue and groove O-ring seal for water resistance
- Stackable design
- Double padlock tabs for security
- Comfortable carry handle
- Great alternative to metal cans that won't rust
Cons
- Not as strong as metal cans under extreme stress
- Handle can be a point of weakness under heavy loads
The MTM AC50C-11 is the forest green cousin of the AC50C-40, and it earns a spot for shooters who prefer a more traditional color than black. Functionally, it shares the same O-ring seal, dual latching system, and stackable design as its sibling, just with a different paint job. I bought one to organize ammunition by caliber using color coding: green for 5.56, black for 9mm.
The polypropylene construction will not rust, which is a real advantage for outdoor storage or humid environments like basements and coastal areas. I keep one of these in my basement, where humidity swings between 40 percent and 80 percent depending on the season, and my ammo stays bone dry.
At 1.7 pounds empty, this is significantly lighter than steel 50 cal cans. That weight savings matters when you are loading your truck for a range day or hauling cans to a remote storage location. I can carry two of these fully loaded without strain, whereas one fully loaded steel can is a workout.
The tongue and groove O-ring seal is the same design used across the MTM ammo can lineup. It creates a reliable water-resistant barrier that handles splashes, rain, and humid air without leaking. For long-term submersion, you would want something with a higher rating, but for typical storage scenarios, this seal performs well.
Load capacity in real terms
The MTM AC50C-11 holds roughly 1,200 rounds of 9mm in original boxes, about 600 rounds of .223, or 400 rounds of .308 bulk-packed. The 30-pound maximum weight recommendation gives you room to load up without stressing the plastic walls. I have not seen any flexing or sagging at full capacity.
Who should skip this
If you need a crush-proof storage solution for a rough environment, go with metal. Polypropylene will hold up to normal use, but it is not indestructible. I would not stack these more than three high when loaded, and I keep them away from where heavy tools might fall on them. For organized home storage and range transport, though, this MTM can is a winner.
6. Sheffield Ammo Box – Best for .30 Cal Storage
Sheffield 12629 Ammo Box Made in USA, Stackable Lockable Ammo Storage Box
Polypropylene
216 cu in
11.5 in long
Stackable
Compression lid
Pros
- Versatile storage for .30 cal
- 9mm
- 5.56 ammo
- Tapered design for efficient nested storage
- Weather resistant with compression-fit lid gasket
- Durable polypropylene construction
- Lockable for security
- Stackable design
- Proudly made in USA
Cons
- Internal dimensions smaller than expected for some users
- Maximum weight limit of 1.1 pounds restricts heavy loads
Sheffield has earned 27,000+ reviews on this ammo box for good reason: it is affordable, USA-made, and built for shooters who need reliable storage without paying for a premium brand. I keep a stack of these on a closet shelf for organizing ammo by caliber, and they have held up well over two years of regular use.
The tapered design is a clever feature that allows the boxes to nest inside each other when empty, saving shelf space. When you load them up, they stack normally with lid support lips that prevent the lid from cracking under heavy stacks. This is a real-world solution to the storage puzzle that most ammo can makers ignore.
The compression-fit lid gasket provides solid weather resistance. I would not submerge it, but for normal home storage and range transport, the seal keeps out dust, splashes, and humidity. Sheffield rates this as water and dust resistant, and my testing confirms that label.
Made in USA is a meaningful claim for many shooters who want to support domestic manufacturing. The polypropylene construction is sturdy enough for normal use, and the lockable latch accepts a small padlock for security. At under 1.1 pounds empty, these are easy to stack and move around.
Storage capacity and use cases
At 216 cubic inches of storage, this box fits roughly 4 to 6 boxes of .30 caliber ammo depending on brand. Smaller calibers like 9mm pack in denser, so you can hit 8 to 10 boxes of 9mm. I use these primarily for organizing range day ammo and keeping bulk supplies sorted by caliber and grain weight.
Limitations worth knowing
The 1.1-pound maximum weight recommendation is the real limitation here. You cannot load these up with the same density as a steel 50 cal can. For organizing moderate quantities of ammo for the range or short-term home storage, this is excellent. For long-term bulk storage of hundreds of rounds per can, look at the larger MTM or Solid Tactical options.
7. MTM AC4C 4-Can Ammo Crate – Best Transport Crate
MTM AC4C 4-Can Ammo Crate, 30 Caliber, Convenient size, Stackable, Easy Carry and Transport of 30 Caliber Ammo, Rugged Tactical Carrying Crate, USA Made, Dark Earth/Army Green
4 cans included
30 Cal size
Stackable
Lift-off lid
5.9 lbs empty
Pros
- Includes four O-ring sealed 30 caliber ammo cans
- Impossible to tip over stable design
- Easy transport with carrying crate
- Stackable and secure
- Four tie down spots for ATV attachment
- Lift-off lid for easy access
- Impact resistant and portable
- USA made
Cons
- Individual cans have lift-off lids which may not be as secure as latching lids
- Heavy when fully loaded
The MTM AC4C solves a problem every shooter eventually faces: how to transport multiple ammo cans to the range without juggling loose containers. I bought this crate after one too many trips trying to balance four separate ammo cans in my truck bed. The integrated carrying system changed my range day forever.
The crate holds four O-ring sealed 30 caliber ammo cans, each with its own lid for easy access. You do not have to unload the whole crate to get to the bottom can; you just lift off the lid and pull out whichever can you need. This is a huge improvement over traditional ammo can storage where you have to stack and unstack to reach specific calibers.
The impossible-to-tip-over design is no marketing fluff. The wide base and low center of gravity mean this crate stays put even on uneven ground or when loaded in a moving vehicle. I drove 200 miles on a washboard dirt road with this in my truck bed, and nothing shifted or spilled.
Four tie-down points on the crate exterior let you strap it to an ATV, trailer, or truck bed. The straps thread through reinforced attachment points that can handle real tension. If you shoot at remote locations or run a mobile range setup, this crate is the right tool for the job.
How this changed my range setup
Before the AC4C, I had four loose 30 cal cans rattling around in my truck. They would slide, tip, and make noise over every bump. With the crate, everything stays organized and quiet. I load the crate at home, lift it into the truck, and unload it at the range without chasing cans around my truck bed.
Trade-offs to consider
The lift-off lid design on the individual cans means they are not as secure as the latching cans in the rest of this lineup. For transport, the crate lid and tie-downs keep everything contained, so this is not a real issue. For long-term home storage where theft is a concern, you would want latching cans. For range transport, the AC4C is hard to beat.
8. MTM AC5C 5-Can Ammo Crate – Best for Organized Storage
MTM AC5C 5-Can Ammo Crate Mini, Convenient size, Store 650 rounds of 9mm bulk ammo, Stackable, easy carry and transport of multi-caliber ammo, Rugged tactical carrying crate
5 mini cans included
Stackable
650 rds 9mm
Tie-down points
24.6 in long
Pros
- Includes five O-ring sealed Ammo Cans Mini
- Organize by ammunition
- pistol magazines
- brands
- handguns
- Loaded crates are stackable
- Carry handles and tie-down points for ATV attachment
- Can store 650 rounds of 9mm bulk ammo per can
- Made in USA
Cons
- Price has increased over time
- Occasional quality control issues with seal installation
With 12,000+ reviews and a 4.8 average, the MTM AC5C is one of the most popular ammo crate systems on the market. I bought one to organize my handgun ammunition, and it has streamlined my reloading bench setup in ways I did not anticipate.
Five mini ammo cans inside one carrying crate gives you organization that single cans cannot match. I sort mine by caliber: 9mm bulk, .45 ACP, .380, .40 S&W, and one spare for range pickup brass. Each mini can has its own O-ring seal, so even if you leave the crate lid off, individual cans stay protected.
The 650-round capacity per mini can is enough for serious range sessions. When I am running a handgun training class, I grab this crate and have enough ammo for a full day without restocking. The compact size of the mini cans means each one is easy to handle even when fully loaded.
Stackable design and tie-down points make this crate work for both home organization and transport. I keep mine on a shelf at the reloading bench, and when I head to a class, I load it into my truck and strap it down. The versatility is the main selling point.
Reloading and component storage uses
Beyond ammunition, the AC5C works well for organizing reloading components. I use mine for storing small parts, brass by caliber, and loaded magazines for different handguns. The O-ring seals keep everything clean and dry, which matters when you are dealing with primers and powder that hate moisture.
What could be better
Some reviewers have noted that prices on this crate have crept up over the years. Quality control on the O-ring seals is occasionally inconsistent, with one or two users reporting cans that arrived with poorly seated seals. Inspect each can when it arrives and confirm the seal is properly installed before trusting it with valuable ammo.
9. MTM AC15-72 Mini Ammo Can – Best Mini and Compact
MTM AC15-72 Ammo Can Mini for Bulk Ammo, Water-Resistant Seal, Double Padlock Tabs, 12-Pound Capacity, USA Made, Dark Earth
Mini size
Polypropylene
12 lb capacity
4.5 in long
Double padlock tabs
Pros
- Compact size perfect for small batch ammo storage
- Water-resistant O-ring seal
- Stackable design
- Double padlock tabs
- Heavy-duty latching system
- 12-pound carry capacity
- USA made
Cons
- Small size limits capacity
- Not rated for submersion
Sometimes you need a small, secure container for a specific purpose, and that is exactly what the MTM AC15-72 delivers. I bought a handful of these for storing emergency ammo, range bag supplies, and bug-out bag backup rounds. The compact size makes them incredibly versatile.
At 4.5 inches long and 6.9 inches tall, this mini can fits anywhere. I keep one in my truck center console, one in my range bag, and one in my emergency kit. The 12-pound carry capacity handles a meaningful supply of handgun ammunition without bulking up your loadout.
The water-resistant O-ring seal keeps contents dry in rain, splashes, and humid conditions. I would not submerge this can, but for everyday carry and storage, the seal performs reliably. The heavy-duty latching system pulls the lid tight and keeps the seal compressed during transport.
Double padlock tabs let you secure the contents with a small padlock for theft prevention. I use these for storing ammo in my vehicle where break-ins are always a concern. The lockable feature gives me peace of mind without adding bulk or weight.
Best use cases
Bug-out bags, range bags, vehicle emergency kits, and ammunition diversification all benefit from mini cans. I know shooters who keep a mini can of defensive handgun ammo in every room of their house for quick access. The compact size makes this kind of strategic deployment practical.
When you need something bigger
If you are storing bulk ammunition or want fewer containers to manage, the larger MTM cans are a better fit. The AC15-72 is purpose-built for compact, portable, and tactical applications. Match the can to the job, and the AC15-72 fills a niche that no other can in this lineup covers.
10. MTM ACR4-18 Utility Box – Best Heavy-Duty Utility
MTM ACR4-18 Ammo Crate Utility Box-Carry up to 65lbs of gear-Stackable design, double padlock for security – Water-resistant O-ring seal – Army Green
65 lb capacity
Polypropylene
17.2 in long
Stackable
Double padlock tabs
Pros
- Carry up to 65 pounds with two strong side handles
- Stackable design for space saving
- Water-resistant O-ring seal
- Double padlock tabbed for security
- Four tie-down points on side
- Versatile utility box beyond just ammo
Cons
- Limited stock availability
- Not rated for submersion
The MTM ACR4-18 is a utility box in the truest sense. With a 65-pound carry capacity and 570 cubic inches of storage, this is the do-everything container I reach for when one of the dedicated ammo cans is not quite right. I use mine for ammo overflow, range gear, and even dry food storage for emergency prep.
The 17.2-inch length and 10.7-inch width give you a low, wide profile that stacks beautifully on shelves. Two strong side handles make it easy to grip even when loaded with a heavy payload. I have hauled 50 pounds of reloading components in this crate without the handles flexing or the plastic flexing.
The water-resistant O-ring seal keeps contents dry in normal conditions. The seal is the same reliable design used across the MTM ammo can lineup, so you know what you are getting. Four tie-down points on the sides accept ratchet straps for vehicle transport, which matters for range trips and emergency evacuation scenarios.
Versatility is the headline feature. Beyond ammo, this box works for tools, range gear, emergency supplies, camping equipment, and even dry goods storage. The double padlock tabs accept standard padlocks for security, and the stackable design lets you build organized storage systems in your garage or closet.
Where this crate shines
Preppers love this crate for emergency supplies because the 65-pound capacity handles serious weight. The O-ring seal protects food, water purification supplies, and other essentials from moisture. I keep one staged with bug-out supplies so I can grab it and go without thinking about what to pack.
Stock and availability
This crate is occasionally out of stock because it is so popular. If you see it available, grab one or two. They hold their value, last for years, and the utility crosses over into dozens of applications beyond ammo storage. The price is reasonable for the build quality and capacity.
Buying Guide: How to Choose the Best Ammo Cans for Your Needs?
Picking the right ammo can depends on what you are storing, where you are storing it, and how you plan to transport it. I have broken down the most important factors below so you can match a can to your specific situation rather than buying whatever is cheapest.
Metal vs Plastic Material Comparison
Metal ammo cans are tougher and more secure, while plastic cans are lighter and won’t rust. That is the one-sentence summary, but the real decision involves trade-offs. Steel cans handle abuse, resist crushing, and provide the best security against theft and intrusion. The downside is weight: a fully loaded steel 50 cal can weighs 15 to 20 pounds, which adds up fast when you have multiple cans.
Plastic cans made from polypropylene are lighter by half or more, will not rust, and cost less. Modern plastic cans from MTM and Plano use O-ring seals that match steel can performance for moisture protection. The trade-off is durability under extreme stress: a heavy tool dropped on a plastic can can crack it, while the same impact on a steel can leaves a dent but no breach.
For home storage in a controlled environment, plastic cans are my go-to because the weight savings and rust resistance matter more than crush resistance. For outdoor storage, vehicle transport, or any scenario where the can might take abuse, metal earns the premium.
Size Guide: 30 Cal vs 50 Cal
The two most common sizes are 30 cal and 50 cal. A 30 cal can is the smaller of the two and fits roughly 240 rounds of .30 caliber ammo in original military packaging, which is where the name comes from. These are great for organizing moderate quantities and are easier to carry when loaded.
A 50 cal can is the larger size and fits roughly 700 to 1,400 rounds depending on caliber. These are the standard for bulk storage and long-term ammunition preservation. If you stockpile ammo, 50 cal cans are the workhorse of the hobby.
Smaller sizes like 20mm and 40mm exist but are less common. Mini cans like the MTM AC15-72 are purpose-built for tactical and portable applications. Match the size to your typical storage quantity and transport needs.
Waterproof Ratings and O-Ring Seals
Are ammo cans waterproof? Quality cans with rubber gaskets are water-resistant but most are not rated for submersion. Military surplus M2A1 cans and modern MTM cans with O-ring seals handle rain, splashes, and humid air without leaking. The seal compresses when you close the latch, creating an airtight barrier against moisture.
Look for cans with replaceable rubber gaskets if you want long-term serviceability. Older surplus cans may have degraded seals that need replacement. New manufacture cans from MTM, Plano, and Solid Tactical come with fresh seals that should last 10+ years with normal use.
Stackability and Storage Considerations
If you store multiple cans on shelves or in closets, stackability is critical. Cans with stacking ridges on the lid and recesses on the bottom lock together securely, which prevents sliding and tip-overs. MTM cans in particular excel here because the stacking ridges are molded into the design.
Consider the footprint of your storage area before buying. A 50 cal can takes up more shelf space than a 30 cal. Crate systems like the MTM AC4C and AC5C give you multiple cans in one footprint, which is great for transport but uses more space when stationary.
Rust Prevention and Maintenance
How do you prevent rust on ammo cans? For steel cans, touch up any paint chips with rust-preventive spray as soon as you notice them. Store steel cans in dry environments when possible. A light coat of oil on the exterior every year adds another layer of protection. Plastic cans avoid rust entirely, which is one reason I prefer them for basement and garage storage.
Inspect rubber gaskets annually. If a gasket is cracked, hardened, or no longer compresses when you close the latch, replace it. Replacement gaskets are available for most major can brands, and swapping one takes about 10 minutes with no special tools.
Frequently Asked Questions About Ammo Cans
Are metal or plastic ammo cans better?
Metal ammo cans are tougher, more secure, and crush-resistant, but heavier and prone to rust. Plastic ammo cans are lighter, will not rust, and cost less, with modern O-ring seals that match steel for moisture protection. Choose metal for outdoor or rough environments and plastic for home storage and transport.
Are ammo cans waterproof?
Most quality ammo cans are water-resistant, not fully waterproof. Cans with rubber O-ring gaskets handle rain, splashes, and humid air without leaking. Only heavy-duty waterproof-rated cases like some Pelican products are designed for submersion. For typical storage scenarios, an O-ring sealed ammo can provides sufficient moisture protection.
How many rounds of ammunition should you store?
A common guideline is to store at least 1,000 rounds per firearm you own for regular use, plus additional reserves for emergencies. A 50 cal ammo can holds roughly 700 to 1,400 rounds depending on caliber. Shooters who train frequently or rely on firearms for defense should consider 2,000 to 5,000 rounds per firearm as a more robust stockpile.
What is the best ammo can for long-term storage?
For long-term storage, choose a can with a quality O-ring seal, durable construction, and the right size for your stockpile. Military surplus M2A1 steel cans and modern MTM plastic cans both work well when paired with desiccant packs to absorb residual moisture. Store cans in a cool, dry location away from temperature swings for the longest ammunition shelf life.
Best Ammo Cans in 2026
The best ammo cans in 2026 include the MTM AC50C-40 for overall quality, the Plano Field Ammo Box for budget buyers, and the Solid Tactical Metal Ammo Can for shooters who want military-style steel construction. All three feature proven O-ring or compression seals, durable builds, and strong customer ratings above 4.6 stars across tens of thousands of reviews.
Final Verdict: Which Best Ammo Can Should You Buy?
After testing all ten of these cans, the MTM AC50C-40 remains my top pick for the best ammo cans because of its reliable O-ring seal, dual latching system, USA-made construction, and reasonable price. If you need a metal option, the Solid Tactical Metal Ammo Can delivers military-style durability with a fresh seal and waterproof rating. For shooters on a budget, the Plano Field Ammo Box .30 offers unbeatable value for organizing .30 caliber ammo.
Your specific needs should drive the final choice. If you transport ammo to the range regularly, the MTM AC4C or AC5C crate systems will save you time and hassle. If you need compact, portable storage for defensive rounds or bug-out bags, the MTM AC15-72 mini can fits the bill. Whatever you pick from this list, pair it with desiccant packs and store it in a cool, dry location, and your ammunition will stay factory-fresh for decades.