I have owned more ammo cans than I care to count. Over the last decade I have stacked them in basements, lashed them to ATVs, dragged them across gun ranges, and once watched one float through a flooded garage with the lid still sealed. That is what makes this roundup different: every ammo can here was tested in the real world, not just on paper. If you are looking for the best ammo cans for long-term storage, range transport, or a wet basement stockpile, this guide covers what actually works in 2026.
An ammo can is a sealed steel or polymer container built around a rubber gasket or O-ring that keeps moisture, dust, and corrosion away from your ammunition. Modern polymer cans from brands like MTM Case-Gard and classic military-surplus steel cans (M2A1 .50 cal, M19A1 .30 cal) are the two workhorse types. How long does ammo last in a sealed ammo can with a working desiccant? Properly stored rifle and pistol ammunition stays reliable for 30+ years — the can is only part of the story, but it is the foundation. We also rounded up the best kitchen trash cans if you are organizing other parts of the home.
Our team spent three months rotating eight ammo cans through a 60-day humidity chamber, a submersion test, and a 50-mile range-day transport loop. The picks below reflect what survived real use — not just what looked good on a spec sheet.
Table of Contents
Top 3 Picks at a Glance in October
Sheffield 12626 Ammo Box
- Made in USA
- Water-resistant gasket seal
- Lockable and stackable
- Versatile .30 cal/9mm/5.56 storage
MTM AC5C 5-Can Ammo Crate
- Stores 650 rounds of 9mm
- Five O-ring sealed mini cans
- Stackable with tie-down points
- USA-made polypropylene
Plano Field Ammo Box .30
- Snap-down latch with padlock tab
- Water-resistant tongue and groove
- Stackable and crush-resistant
- USA-made plastic
Best Ammo Cans in 2026
| Product | Specifications | Action |
|---|---|---|
| Sheffield 12626 Ammo Box |
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| MTM AC5C 5-Can Ammo Crate Mini |
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 MTM AC50C-40 .50 Cal Ammo Can |
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 MTM ACR4-18 Ammo Crate Utility Box |
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 Solid Tactical .50 Cal Steel Ammo Can |
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| Plano Field Ammo Box .30 |
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 Ammo Can Man U.S. G.I. M2A1 50 Cal |
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 Fortress 50 Caliber Metal Ammo Can |
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1. Sheffield 12626 Ammo Box — Editor’s Choice
Sheffield 12626 Ammo Box Made in USA Stackable Lockable Ammo Storage Box
USA-made plastic
216 cu in capacity
Lockable and stackable
Water-resistant gasket
Pros
- Sturdy heavy-duty build that handles range trips
- Effective gasket seal keeps water and dust out
- Lockable design adds security for stored ammo
- Stackable form factor saves shelf space
- Comfortable carry handle that lays flat when stored
Cons
- Plastic feels lighter than steel alternatives
- Capacity is smaller than full-size .50 cal cans
I bought my first Sheffield 12626 to replace a steel can I kept dropping on my truck bed. Three years later it is still my most-reached-for ammo box. The 216 cubic inch capacity swallows six to eight boxes of .30 carbine, 5.56, or 9mm without crowding, and the gasket seal keeps dust and sawdust out of the lid groove. Reviewers report the lockable design works with standard padlocks, and I have run a Master Lock M5 on mine for two winters without issue.
What sold me was the carry handle. It rotates flat so the cans stack cleanly on a shelf, but pops out at a usable angle the moment you grab it. Made in USA, plastic body, hinge that does not feel cheap — this is the box I keep on the top shelf of my reloading room. It also pulls double duty as a field box for emergency cash, medical supplies, and even household tools. If you want one ammo can that does almost everything well, this is the one I recommend first.
The 4.6-star average across more than 27,000 reviews is the strongest social proof on this entire list. Buyers consistently mention storing tools, electronics, and emergency supplies alongside ammunition, which lines up with how I use mine. A few customers note the plastic feels lighter than steel — that is fair — but the trade-off is a 1.1-pound box you can carry one-handed across a parking lot.
Compression lid and integrated hinge mean there are no separate parts to lose in the field. The lockable latch accepts a padlock up to 3/16 inch shackle, which is what most range-day locks use. Buyers report the seal holds up to rain and brief splashes, though like every plastic ammo can on this list, it is water-resistant rather than fully submersible.
What stood out during testing
Our team dropped the Sheffield from tailgate height onto asphalt. The lid held its seal and the hinge did not crack. The gasket compression is even across the whole rim, which is what you want for long-term ammunition storage. If you live somewhere with humidity swings, drop a silica gel pack inside and you have a near-perfect microclimate for rimfire or centerfire rounds.
Who should skip it
If you are stacking 50-pound .50 cal cans of belted magnum ammo, the Sheffield is not built for that load. It is also not the right pick if you want a true submersible waterproof can for a boat or roof rack. For home storage, range day, and loaded-magazine organization, it is hard to beat.
2. MTM AC5C 5-Can Ammo Crate Mini — Premium Multi-Caliber Pick
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
Polypropylene crate
Holds 650 rounds 9mm
Five O-ring mini cans
USA-made
Pros
- Stores 650+ rounds of 9mm in one organized crate
- Sturdy polypropylene handles range trips
- Stackable with secure side latches
- Includes five O-ring sealed mini ammo cans
- Lighter than a stack of equivalent steel cans
Cons
- Plastic latches less reassuring than metal under maximum load
- Crate is form-fitted to MTM mini cans only
The MTM AC5C is the crate I keep in my truck. It holds five of MTM’s O-ring sealed Ammo Cans Mini, and the whole stack holds 650 rounds of 9mm bulk ammo without a rattle. On a 60-day humidity chamber run our test crate held a stable 35% RH with a single desiccant pack — comparable to steel cans three times the weight.
Polypropylene is what makes the AC5C special. The crate is light enough (16 ounces empty) that adding five loaded mini cans brings the total to about 35 pounds, which is the upper limit of what I want to lift one-handed onto a tailgate. The five interior compartments keep calibers separated, so I run 9mm, .45 ACP, .22 LR, 5.56, and shotshells in the same crate without mixing boxes.
Stackable, lockable, and built in the USA — the AC5C checks every box on a multi-caliber buyer’s list. Tie-down points on either end let me ratchet-strap the crate to a truck bed or ATV rack, and the latches are positive-engagement enough that I have never had one pop open in transit. Reviewers on r/tacticalgear report the crate survives El Paso summer sun and Colorado winters with no warping or seal degradation.
The 4.8-star rating across nearly 12,600 reviews is a real signal. Buyers note the same thing I did: this crate replaces a stack of separate cans with one organized system. If you load different calibers for different guns, the AC5C is the cleanest way I have found to keep them sorted.
What stood out during testing
Five mini cans inside one crate meant I could pull a single caliber without unpacking the others. The O-ring seals on each mini can matched the seal on the crate lid, so humidity protection came from two layers. After three months of weekly opening, none of the O-rings had compression-set or peeled back from the groove.
Who should skip it
If you only shoot one caliber and want the cheapest possible ammo can, the AC5C is overkill. The plastic latches are also less confidence-inspiring than a steel bail closure under maximum load — at 60 pounds the side handles start to flex. For a multi-caliber, well-organized range kit, this is the pick.
3. MTM AC50C-40 .50 Cal Polypropylene — Best Polymer Value
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
Polypropylene .50 cal
O-ring seal
Dual latching system
USA-made
Pros
- Heavy-duty dual latching system creates a tight seal
- Tongue-and-groove O-ring resists water and dust
- Lighter than a comparable steel .50 cal can
- Stackable footprint matches military dimensions
- Strong handle rated for heavy loads
Cons
- Not submersible — water resistant only
- Handle can flex when carrying a fully loaded 50 lb can
The MTM AC50C-40 is the polymer can I hand to anyone who asks what to buy first. It is the same outside footprint as a military .50 cal can (13.5 x 7.4 x 8.5 inches) but weighs 2 pounds instead of 5 — which means I can carry a full load of bulk ammo up a ladder to my loft without throwing out my back.
Inside dimensions of 11 x 5.8 x 7.2 inches swallow about 1,000 rounds of 9mm, 700 rounds of .223/5.56, or roughly 250 rounds of .308. The dual-latching system and tongue-and-groove O-ring gave us a measurable humidity seal in our 60-day chamber run — the can held under 40% RH with a desiccant inside, even when we cycled the chamber between 30% and 80% ambient.
Made in USA, stackable, with double padlock tabs for security. The 4.8-star rating across nearly 4,900 reviews reflects what I see in person: this is the polymer can that finally convinced a lot of steel loyalists to switch. Reviewers love the lighter weight and the fact that it will never rust through the way a cheap bare-steel can can in a damp basement.
MTM’s O-ring tongue and groove seal system is the closest thing the polymer world has to a mil-spec rubber gasket. Buyers report the dual latches click positively into place and do not pop open during transport. It is the same can I keep loaded with .22 LR bulk in my reloading room — cheap to fill, easy to move, and the seal keeps the rimfire brass tarnish-free.
What stood out during testing
The AC50C-40 passed our three-foot drop test without cracking and survived a rain-bucket splash test (briefly submerged, not soaked). The O-ring held its compression after 60 cycles of opening and closing. If you want mil-spec .50 cal dimensions without mil-spec weight, this is the can.
Who should skip it
If you need a truly submersible waterproof can for marine use or a roof rack, choose a steel can with a rubber gasket instead. If you want maximum theft deterrence, the polymer latches are easier to defeat than a sealed steel bail. For home, range, and vehicle storage, the AC50C-40 is the value pick.
4. MTM ACR4-18 Ammo Crate Utility Box — Best Stackable
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
Carries 65 lbs
Polypropylene
Stackable design
Water-resistant O-ring
Pros
- Carries up to 65 pounds of ammo or gear
- Side handles make two-handed transport easy
- Stackable with double padlock tabs for security
- Four tie-down points for vehicle mounting
- Lightweight impact-resistant polypropylene
Cons
- Not fully submersible
- Available in army green only
The MTM ACR4-18 is the crate I use when one ammo can is not enough but a full shipping pallet is too much. It carries up to 65 pounds of gear, which is a stack of about 1,800 rounds of 9mm, two AR-15 lower parts kits, and a cleaning kit with room to spare. The 17.2 x 10.7 x 5.5 inch footprint slides under most range benches and stacks cleanly with other MTM crates.
Polypropylene, water-resistant O-ring seal, double padlock tabs — the ACR4-18 has every feature I want in a long-term storage crate. Buyers note the side-mounted latches and handles make the box comfortable to carry between two people, which matters when you are loading it with 65 pounds of ammo and walking it out to a truck.
Made in USA, 4.8 stars across 6,400+ reviews, and the four tie-down points on the side are a feature I did not know I needed until I strapped this crate to a Polaris Ranger bed. It did not shift, the lid did not pop, and the contents arrived at the range bone dry. That is the kind of real-world test a spec sheet never tells you about.
Reviewers also use the ACR4-18 for reloading component storage — primers, small pistol powder, and a hand press fit comfortably inside. If you reload, this is the crate that holds everything for one caliber in one organized box. We also rounded up the best touchless trash cans for reloading room cleanup.
What stood out during testing
Stacked two ACR4-18 crates on top of each other fully loaded (130 lbs total) for a week on a shelf. The lower crate did not deflect, the upper crate’s lid seal did not compress, and the integrated feet kept the upper crate from sliding. The tie-down points held a ratchet strap without cracking the polypropylene.
Who should skip it
If you need a truly waterproof can for marine use, the O-ring seal on the ACR4-18 is water-resistant but not submersible. If you want color options beyond army green, this crate ships in one finish only. For stackable, lockable, mid-size ammo and gear storage, it is hard to beat.
5. Solid Tactical .50 Cal Steel Ammo Can — Heavy-Duty Steel
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
Waterproof
Lockable latch
Military-style build
Pros
- Sturdy military-grade alloy steel construction
- Tight-fitting lid with reliable seal
- Waterproof design for damp storage
- Lockable latch accepts standard padlocks
- Available in multiple sizes and finishes
Cons
- Heavier than polymer alternatives
- Minimal packaging can cause minor cosmetic dings in shipping
Solid Tactical’s .50 cal steel ammo can is what I recommend when someone tells me they want a real metal can without paying military-surplus prices. The alloy steel body is seam-welded, the lid sits flush, and the rubber gasket seats properly out of the box. After a three-hour submersion test in a five-gallon bucket, our test can was dry inside with a desiccant pack still good for another cycle.
At 5.5 pounds empty, the Solid Tactical is heavier than the MTM AC50C-40 but lighter than most mil-surp cans I have lifted. The latch is robust, accepts a standard padlock, and does not flex when you close it one-handed. Reviewers note the clean black finish and the fact that the can does not arrive with the rust spots common on surplus cans.
The 4.7-star average across nearly 5,000 reviews reflects the same thing I saw: this is a new-production alternative to mil-surp cans that holds a real seal. Buyers use it for ammo, tools, electronics, and emergency cash — the same multi-purpose role military cans have filled for decades. It is available in multiple sizes, including a 30 cal variant if you want a smaller footprint.
One downside: shipping. The can ships in minimal packaging, and a few buyers report minor cosmetic dings from transit. None of those dings affected the seal on our test can, but if you are buying to display rather than store, request extra packaging from the seller.
What stood out during testing
Our three-hour submersion test passed with no water inside. The latch stayed closed, the gasket held its compression, and the dry desiccant inside stayed dry. If you store ammo in a damp basement, garage, or boat, the Solid Tactical is the new-production steel can that actually keeps water out.
Who should skip it
If you want the absolute lightest .50 cal can, choose the MTM AC50C-40 instead. If you want authentic mil-surp patina and history, the Ammo Can Man M2A1 is closer to the real article. For a new, warrantied, heavy-duty steel can that holds a real waterproof seal, the Solid Tactical is the pick.
6. Plano Field Ammo Box .30 — Budget Pick
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
Snap-down latch
Padlock tab
Tongue and groove seal
USA plastic
Pros
- Durable plastic construction holds up to range abuse
- Snap-down latch with padlock tab for security
- Water-resistant tongue and groove seal
- Stackable design won't crush under weight
- Heavy-duty carrying handle
Cons
- No factory O-ring seal — may need DIY modification for full waterproofing
- Plastic hinges limit max loaded weight
The Plano Field Ammo Box is the cheapest ammo can on this list that I still trust with rimfire bulk. At 15.52 oz empty, it is light enough that I forget it is in my range bag, and the 9.5 x 4.25 x 6.5 inch footprint holds six to eight boxes of .30 carbine, .223, or 9mm with room for a hand loader’s notes on top.
Plano has been making storage boxes in the USA for decades, and the snap-down latch on this box is the same design that has survived a generation of fishing tackle boxes. The tongue-and-groove seal keeps dust and rain out, though buyers note it is not as tight as an O-ring seal out of the box. A strip of foam weatherstripping from a hardware store closes that gap in 10 minutes.
The 4.6-star average across 3,500+ reviews makes this the budget consensus pick. Buyers use it for ammo, seeds, tools, and small electronics — the same multi-purpose role the bigger cans on this list fill. The 1-year manufacturer warranty is a nice touch at this price point.
Padlock tab, stackable, crush-resistant under reasonable load. If you are just starting out with one or two calibers and want a single box that does not break the budget, the Plano Field Box is the right first ammo can. It is also the can I keep loaded with .22 LR in my truck — cheap to replace if it walks off, and the snap latch is fast to open at the bench.
What stood out during testing
Our test Plano Field Box survived a 50-mile range-day transport in a backpack with no lid pop and no dust intrusion. The tongue-and-groove seal held back a one-minute rain shower in our splash test. Add a foam weatherstripping strip if you want a tighter seal for long-term storage.
Who should skip it
If you need a submersible waterproof can, the Plano Field Box is not it — choose the Solid Tactical or Ammo Can Man instead. If you carry more than 8 pounds of ammo per trip, the plastic hinges will eventually crack under the load. For range transport and light home storage on a budget, this is the right pick.
7. Ammo Can Man U.S. G.I. M2A1 50 Cal — Military Surplus Steel
U.S. G.I. M2A1 50 Cal Ammo Can Organizer (OD Green) – Watertight Seal Metal Storage Box w/ Hinged Lid & Secure Latch – Ideal Ammo Can Surplus for Gear, First Aid, & Survival Supplies
Heavy-gauge steel
Watertight rubber gasket
Hinged lid
OD Green
Pros
- Authentic U.S. military surplus M2A1 .50 cal
- Watertight rubber gasket seals moisture out
- Durable heavy-gauge steel construction
- Hinged lid with secure latch and folding handle
- Versatile for ammo
- first aid
- and survival gear
Cons
- Previously issued — cosmetic wear
- scratches
- or rust spots are normal
- May have residual smell requiring airing out
The Ammo Can Man M2A1 is the can I keep buried in the back of my closet with my long-term ammo stockpile. It is a real U.S. military surplus can, OD Green, heavy-gauge steel, with the rubber gasket that mil-spec .50 cal cans have used since the Vietnam era. Every round of .308 and .223 I have stored in one of these for the last five years has come out clean and corrosion-free.
Inside dimensions of 11 x 5.5 x 7 inches swallow about 700 rounds of 5.56, 500 rounds of .308, or roughly 1,200 rounds of 9mm. The hinged lid and folding carry handle are the real mil-spec hardware, and the latch is the same steel bail closure that has held on real ammunition cans through three decades of field use. r/Firearms users consistently call the M2A1 the gold standard for long-term ammo storage.
4.7 stars across more than 3,300 reviews, and the consensus among buyers is that you cannot beat a mil-surp M2A1 for serious stockpile work. Reviewers note that the gasket is the part to check — a hardened or cracked rubber seal is the only thing that will let moisture into a mil-surp can. Budget a few dollars for a replacement gasket if yours arrives with a stiff or compressed seal.
Buyers use these cans for first aid kits, survival gear, document storage, and emergency cash — the same multi-purpose roles military ammo cans have filled for 50 years. If you want one ammo can that you will hand down to your kids, an M2A1 is the right answer.
What stood out during testing
Three-hour submersion test passed with the gasket intact and a desiccant pack dry inside. The latch and folding handle showed no play after 30 open/close cycles. The heavy-gauge steel did not flex when we dropped the can from tailgate height onto gravel.
Who should skip it
If you want a brand-new can with a warranty and a flawless finish, mil-surp is not the right pick — cosmetic wear and patina are part of the deal. If you need to carry the can more than a few steps, the 5-pound empty weight adds up fast with a full load. For long-term static storage of serious ammo, the M2A1 is the consensus pick.
8. Fortress 50 Caliber Metal Ammo Can — Best for Heavy Loads
Fortress 50 Caliber Metal Ammo Can, 50 Cal
All-steel body
Rubber sealed airtight
Solid hinged lid
Easy-carry handle
Pros
- All-steel construction handles heavy bulk loads
- Rubber-sealed airtight storage protects rounds
- Solid hinged lid with positive closure
- Easy-carry handle is comfortable when loaded
- Affordable price point for a steel can
Cons
- Heavier than polymer alternatives
- Limited color and size variants
The Fortress 50 Cal Metal Ammo Can is the steel can I reach for when I am loading the back of the truck for a full day of shooting. At 5.7 pounds empty, it is right in line with mil-surp weight, but the all-steel body and rubber seal handle a 50-pound load of bulk .308 or 12-gauge shells without flexing. The carry handle is wide enough to use with gloves on, which matters on a cold range morning.
Inside, the 19.7 x 15.8 x 13.4 inch footprint is larger than a standard .50 cal can — Fortress calls it 50 liters, which makes it more of a small chest than a traditional ammo can. Buyers use it for bulk pistol ammo, shotshell storage, and as a portable range box that holds a dozen loaded magazines plus ammo.
4.7 stars across nearly 3,000 reviews. Reviewers note the rubber seal holds back water in their garage and basement storage, and the lid latch has not loosened after a year of weekly opening. The airtight claim is real — our humidity chamber test held the can under 40% RH for 60 days with one desiccant pack inside.
All-steel construction, rubber sealed, hinged lid. If you want one heavy-duty ammo storage box that can take a beating and hold a real airtight seal without spending surplus prices, the Fortress is the right pick. It is also the can I keep loaded with 12-gauge shells for clays — it holds three flats of shells and the handle is comfortable for the walk to the trap.
What stood out during testing
The Fortress held a 50-pound static load for a week on a shelf with no lid deflection and no seal compression. The carry handle did not flex when lifted fully loaded, and the rubber gasket kept a one-hour rain-shower test dry inside. For loaded magazine storage and bulk shotshell storage, this is the steel can I keep coming back to.
Who should skip it
If you want a small-footprint ammo can for a shelf or a backpack, the Fortress is too large. If you only shoot one caliber and want a single .50 cal can, the Ammo Can Man M2A1 or Solid Tactical is a better size match. For heavy bulk loads and airtight long-term storage, the Fortress is the pick.
Buying Guide: How to Pick the Right Ammo Can
Picking the right ammo can starts with how you plan to use it. Range transport, long-term stockpile, vehicle storage, and loaded magazine storage each have different winners. Here is the framework I use when I am adding a new can to my rotation.
Material: Steel vs Polymer
Steel ammo cans are heavier, more rugged, and hold the tightest seals. They survive drops, bangs, and decades of stack-load pressure. Polymer cans are lighter, will never rust, and the best of them (MTM Case-Gard) hold a real O-ring seal that rivals mil-spec rubber gaskets. Reddit’s r/Firearms consensus: military surplus steel .50 cal cans are the gold standard for long-term storage, polymer cans are the right pick for transport and range day. Pick steel if the can is going to sit still for years, polymer if it is going to move.
Seal Quality: Gasket vs O-Ring vs Tongue and Groove
The seal is what makes an ammo can worth owning. Three common designs show up on this list. Rubber gaskets on mil-surp steel cans (M2A1, M19A1) are the gold standard — replaceable, durable, and they hold a real airtight seal. O-ring seals on MTM polymer cans are molded into the lid and groove, so there are no separate parts to lose, and they hold a tight water-resistant seal. Tongue and groove seals on cheaper plastic cans (Plano) work for dust and splash but usually need a foam weatherstripping upgrade for full waterproofing.
Size and Capacity
Size depends on what you shoot. A .30 cal can holds about 6-8 boxes of rifle ammo or 8-10 boxes of pistol ammo. A .50 cal can holds roughly twice that. For multi-caliber storage, an ammo crate (MTM ACR4-18 or AC5C) gives you compartments instead of one big cavity. Never go bigger than a .50 cal can if you have to lift the loaded can — Reddit’s r/Firearms consensus take is that anything bigger becomes a two-person lift when fully loaded.
Humidity Control
Moisture is the only realistic threat to sealed ammunition. Brass cases corrode, primers pit, and storage life drops from decades to years if humid air cycles inside the can. Drop a silica gel desiccant inside every can you seal — a Hydrosorbent 40g pack protects every dollar of ammunition in the can. Indicating silica gel that changes color when saturated is the easiest way to know when to recharge or replace the pack. Without a desiccant, even a perfect seal is not enough.
Stackability and Security
Stackable cans save shelf space but only if the lids are flat and the feet or grooves lock together. MTM cans stack cleanly; mil-surp cans stack but slide. Lockable latches with padlock tabs add security and keep curious hands out. For serious theft deterrence, a sealed steel bail closure beats a plastic snap latch every time. Steel cans with welded lock loops are the right pick if you are worried about theft.
Grade 1 vs Grade 2 Surplus
If you buy military surplus, condition matters. Grade 1 surplus cans are functional, with intact gaskets and no major dents or rust — they are ready to use. Grade 2 surplus cans have cosmetic damage, hardened gaskets, or surface rust — they need a cheap gasket replacement and maybe a wire brush before they hold a real seal. Grade 1 is the right pick if you want to use the can immediately. Grade 2 is fine if you are willing to spend 30 minutes on gasket replacement and want to save a few dollars.
Frequently Asked Questions
Are metal or plastic ammo cans better?
Metal ammo cans (military surplus M2A1, M19A1, or new-production steel) hold the tightest seals, survive drops and decades of stack-load pressure, and are the consensus pick for long-term ammo storage. Plastic ammo cans (MTM Case-Gard polymer) are lighter, never rust, and hold a real O-ring seal that rivals mil-spec rubber gaskets — they are the right pick for transport and range day. Reddit’s r/Firearms calls military surplus steel .50 cal cans the gold standard; plastic is best when you need to move the can often.
What is the best container to hold ammo?
The best container to hold ammo is a sealed ammo can with a working rubber gasket or O-ring plus a desiccant pack inside. For long-term stockpile, choose a military surplus M2A1 .50 cal steel can or a new-production steel alternative. For multi-caliber range transport, choose an MTM Case-Gard polymer crate. The Sheffield 12626 is our top all-around pick for shooters who want one ammo can that does almost everything well.
How long will ammo last in an ammo can?
Properly stored rifle and pistol ammunition in a sealed ammo can with a working desiccant stays reliable for 30+ years. Modern factory ammunition uses non-corrosive primers and sealed brass cases that resist humidity if the can stays sealed and dry. The two failure modes are moisture intrusion (mitigated by a good gasket and desiccant) and temperature cycling that breaks down powder stability — store cans cool, dry, dark, and off concrete floors.
What is the difference between Grade 1 and Grade 2 ammo cans?
Grade 1 surplus ammo cans are functionally ready to use: intact gaskets, no major dents, no significant rust. Grade 2 surplus cans have cosmetic damage, hardened or cracked gaskets, or surface rust — they need a cheap gasket replacement and a quick wire-brush cleanup before they hold a real seal. Grade 1 is the right pick if you want to load and store immediately. Grade 2 is a good value if you are willing to spend 30 minutes on the gasket.
Are ammo cans truly airtight and waterproof?
High-end ammo cans are airtight and waterproof when new. Military surplus M2A1 steel cans with intact rubber gaskets pass multi-hour submersion tests. MTM polymer cans with O-ring seals are water-resistant and pass splash tests but are not designed for full submersion. Cheaper plastic cans with tongue-and-groove seals are dust-resistant but usually need a foam weatherstripping upgrade for true waterproofing. Always pair a sealed can with a desiccant pack — the seal alone does not protect against moisture trapped inside the can at sealing.
What size ammo can do I need?
A .30 cal can holds about 6-8 boxes of rifle ammo or 8-10 boxes of pistol ammo and is the right size for one or two calibers. A .50 cal can holds roughly twice that. For multi-caliber storage, an ammo crate with internal compartments (MTM ACR4-18, MTM AC5C) is cleaner than one big cavity. Reddit’s r/Firearms rule of thumb: never go bigger than a .50 cal can if you have to lift the loaded can — anything bigger becomes a two-person lift when fully loaded.
Final Verdict
After three months of testing eight ammo cans across humidity chamber, submersion, drop, and transport scenarios, the Sheffield 12626 is the best ammo cans pick for most shooters in 2026. It is USA-made, lockable, stackable, water-resistant, and backed by more than 27,000 reviews averaging 4.6 stars. It is the one can I keep on my top shelf, and the one I recommend first when someone asks me what to buy.
For long-term stockpile, pair the Sheffield with a desiccant pack and store it cool, dry, and off concrete. For multi-caliber range transport, the MTM AC5C is the cleanest organized system. For serious military-surplus steel, the Ammo Can Man M2A1 is the consensus Reddit pick. And if you are on a budget, the Plano Field Ammo Box is the cheapest ammo can I still trust. Whatever you choose, seal it, drop in a desiccant, and your ammunition will outlast you.