Best Ammo Can 2026: Steel, Plastic & Surplus Storage Cans Compared
Quick Answer: The best ammo can overall in 2026 is a U.S. Military Surplus M2A1 .50 Cal Steel Ammo Can (Grade 1, ~$18-20) — a genuinely mil-spec welded-steel box with a rubber gasket seal, at a fraction of the price of buying new. For a lighter option that will never rust, the MTM Case-Gard AC50C (~$14-16) is roughly half the weight of steel with a fresh O-ring seal. The Plano Field Ammo Box .30 Cal (~$17-20) is the easiest to find on short notice at any big-box store, and a compact M19A1 .30 Cal steel surplus can (~$16-17) is the right size for documents, cash, or a first-aid stash rather than bulk ammo.
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An ammo can is one of the cheapest genuinely waterproof storage options a prepper can buy, and its use case goes well beyond ammunition. Ready.gov specifically recommends storing copies of insurance policies, identification, and bank account records in a waterproof, portable container as part of a family emergency kit — a sealed ammo can is a common, inexpensive way to check that box. A Grade 1 surplus M2A1 steel can weighs about 4.87 lbs empty and holds up to 800 rounds of 5.56, per manufacturer specs, which gives you a sense of just how much bulk gear, food, or documents it can actually swallow.
We compared steel military surplus, modern plastic, and widely-stocked retail cans across seal quality, weight, size options, and real street price rather than MSRP.
The one-line rule: Check the gasket before you trust any ammo can with something irreplaceable — on used steel surplus cans inspect it for cracks or gaps, and on new plastic cans confirm the O-ring is seated correctly, since the seal (not the metal or plastic) is what actually keeps water out.
Quick Picks: Best Ammo Cans
- Best Overall: U.S. Military Surplus M2A1 .50 Cal Steel — Grade 1, watertight rubber gasket
- Best Lightweight/Plastic: MTM Case-Gard AC50C — half the weight of steel, O-ring seal
- Best Budget & Most Available: Plano Field Ammo Box .30 Cal — stocked at most big-box stores
- Best Compact for Documents: U.S. Military Surplus M19A1 .30 Cal Steel — smaller, grab-and-go size
- Best for Bulk Stockpiling: Multi-pack surplus .50 Cal cans — lowest cost per can
Top 5 Best Ammo Cans Reviewed
1. U.S. Military Surplus M2A1 .50 Cal Steel Ammo Can — Best Overall
The U.S. Military Surplus M2A1 .50 Cal Steel Ammo Can is the genuine welded-steel article the military actually used, sold as decommissioned surplus once it is retired from service. A Grade 1 (near-new condition) can runs roughly $18-20 and includes the original rubber gasket seal that made these cans watertight during amphibious landings and river crossings in the first place. Inside dimensions run about 11 x 5.5 x 7.25 inches and it holds up to 800 rounds of 5.56, or a comparable volume of food, documents, or gear.
If your cache also includes printed reference material — first-aid steps, radio frequencies, land-nav notes — a free trial of Kindle Unlimited is worth checking out for field guides you can download and print before you seal the can.
Key Features:
- Genuine mil-spec welded steel, not a replica
- Rubber gasket seal, watertight when intact
- Inside dimensions ~11 x 5.5 x 7.25 in, ~4.87 lbs empty
- Holds up to 800 rounds of 5.56 or equivalent bulk storage
- Roughly $18-20 per can (Grade 1 used)
Because these are used, inspect the gasket for cracks before trusting it with anything you cannot afford to get wet — Grade 1 condition means minimal wear, but it is still a used product. Pair one with your first aid kit supplies or a spare set of fire-starting gear for a self-contained, waterproof module.
2. MTM Case-Gard AC50C — Best Lightweight/Plastic
The MTM Case-Gard .50 Cal Ammo Can (AC50C) is molded from rugged polypropylene and, per the manufacturer, weighs about half what a steel M2A1 can weighs empty — a real difference if this can is going in a bug-out bag or vehicle kit rather than sitting on a shelf. It uses a tongue-and-groove O-ring seal instead of a rubber gasket, a heavy-duty dual latching system, and molded-in stacking ridges, and it runs about $14-16.
Key Features:
- Polypropylene plastic, roughly half the weight of steel
- Tongue-and-groove O-ring water-resistant seal
- Dual latching system with double padlock tabs
- Rated for a 30-lb carry capacity, per MTM
- Made in the USA, roughly $14-16
It will never rust the way a steel can eventually can if the paint chips, and the seal is fresh out of the box rather than decades old. It costs slightly more per can than budget steel surplus, but for gear you carry rather than store, the weight savings matter. Fits well alongside a tactical backpack loadout.
3. Plano Field Ammo Box .30 Cal — Best Budget & Most Available
The Plano Field Ammo Box .30 Cal is the option most likely to be sitting on a shelf at your local Walmart or sporting-goods store right now, which matters if you need to restock storage capacity on short notice rather than wait on shipping. It uses an O-ring seal and Plano's brass-bailed latch for a secure, water-resistant close, holds roughly 6-8 boxes of ammo, and runs about $17-20.
Key Features:
- O-ring seal with brass-bailed latch
- Widely stocked nationwide at big-box and sporting-goods stores
- Holds roughly 6-8 boxes of ammo or equivalent gear
- Lightweight molded plastic construction
- Roughly $17-20
It is not as heavy-duty as mil-spec steel, but for most household prepping needs — extra first-aid supplies, spare batteries, or a document cache — the availability and price make it a practical default. Good complement to a 72-hour emergency kit.
4. U.S. Military Surplus M19A1 .30 Cal Steel Ammo Can — Best Compact for Documents
The U.S. Military Surplus M19A1 .30 Cal Steel Ammo Can is the smaller sibling of the M2A1, measuring roughly 7.25 x 3.5 x 8 inches and weighing about 4 lbs empty — small enough to grab one-handed on the way out the door. A Grade 1 example runs about $16-17, and like the .50 cal version it uses the original rubber gasket for a watertight seal when the gasket is in good shape.
Key Features:
- Genuine mil-spec welded steel, compact size
- Rubber gasket seal, watertight when intact
- ~7.25 x 3.5 x 8 in, ~4 lbs empty
- Right-sized for documents, cash, meds, or a compact first-aid stash
- Roughly $16-17 (Grade 1 used)
This is the size Ready.gov's document-storage guidance maps to most naturally — insurance policies, ID copies, and bank records do not need an 800-round can's worth of space. Keep it in your bug-out bag or a designated grab-and-go spot.
5. Multi-Pack Surplus .50 Cal Cans — Best for Bulk Stockpiling
Buying surplus M2A1 .50 cal cans in a multi-pack (commonly sold in 2-, 4-, or 10-can bundles) drops the per-can price noticeably below buying singles — bulk 6-packs of Grade 1 cans have been seen for roughly $17 per can versus $18-20 individually. If your plan involves multiple stackable, watertight storage modules for a cache, root cellar, or garage shelf rather than just one can, buying in bulk is the more cost-effective route.
Key Features:
- Same mil-spec steel and gasket seal as single cans
- Lower cost per can than buying individually
- Stackable for organized shelf or cache storage
- Sold in 2-, 4-, 6-, or 10-can bundles depending on retailer
- Condition grade varies by seller — confirm Grade 1 or 2 before buying
Grade can vary between multi-pack listings more than single-can listings, so check the seller's grading description before buying — a mixed-grade pack is fine for gear storage but worth avoiding if watertightness is critical. Useful for organizing a long-term food storage setup or a modular prepper checklist buildout.
Ammo Can Comparison Chart
| Product | Material | Seal Type | Size | Price | Best For |
|---|---|---|---|---|---|
| M2A1 .50 Cal Steel Surplus | Welded steel | Rubber gasket | ~11 x 5.5 x 7.25 in | ~$18-20 | Best overall / durability |
| MTM Case-Gard AC50C | Polypropylene plastic | O-ring | ~11 x 5.5 x 7.25 in | ~$14-16 | Best lightweight / no rust |
| Plano Field Ammo Box .30 Cal | Plastic | O-ring + brass latch | Holds 6-8 ammo boxes | ~$17-20 | Best budget / most available |
| M19A1 .30 Cal Steel Surplus | Welded steel | Rubber gasket | ~7.25 x 3.5 x 8 in | ~$16-17 | Best compact / documents |
| Multi-Pack Surplus .50 Cal | Welded steel | Rubber gasket | ~11 x 5.5 x 7.25 in each | ~$17/can bulk | Best for bulk stockpiling |
How to Choose an Ammo Can
Check the Seal, Not Just the Material
A can is only as watertight as its seal. On steel surplus cans, that means inspecting the rubber gasket for cracks, gaps, or dry rot before you load it — a Grade 1 rating means light cosmetic wear, not a guaranteed new gasket. Plastic cans use an O-ring that is fresh out of the box and tends to hold up longer since rubber-on-steel gaskets are the more common failure point on older surplus cans.
Match Size to What You're Storing
A .50 cal can (roughly 11 x 5.5 x 7.25 inches) fits bulk ammo, food pouches, or a full first-aid module. A .30 cal can (roughly 7.25 x 3.5 x 8 inches) is the better fit for documents, cash, meds, or anything you want to grab in one hand — oversized cans for small items just waste cache space.
Steel vs. Plastic Tradeoffs
Steel surplus cans win on abuse resistance and cost per can, especially in bulk. Plastic cans win on weight — roughly half that of steel per the manufacturer — and never rust, which matters more for a can you carry regularly than one that sits in a cache. Neither is the wrong choice; match it to whether the can travels or stays put.
Beyond Ammunition: What Preppers Actually Store
Ready.gov's guidance to keep important documents in a waterproof, portable container is one of the most common real-world uses for an ammo can that has nothing to do with firearms. Fire-starting kits, seeds, a compact first-aid stash, ham radio gear, and matches or lighters are the other frequent picks — anything that needs to survive flooding, humidity, or being buried without degrading.
Frequently Asked Questions
Are ammo cans actually waterproof?
A genuine mil-spec ammo can with its rubber gasket intact is watertight, not just water-resistant — the steel M2A1 and M19A1 cans were designed to keep ammunition dry during amphibious landings and river crossings. The catch is the gasket: on used military-surplus cans it can be cracked, missing, or improperly seated, so check it before you trust one with anything you cannot afford to get wet. Plastic cans like MTM Case-Gard and Plano use a tongue-and-groove O-ring seal that tends to hold up longer since it never rusts, though it is still worth a visual check before storage.
What is the difference between a .30 cal and .50 cal ammo can?
The names are legacy military designations for size, not a strict rule about what you can store inside. A .30 cal can (M19A1) measures roughly 7.25 by 3.5 by 8 inches and weighs about 4 pounds empty — small enough to grab one-handed and ideal for documents, cash, or a compact first-aid stash. A .50 cal can (M2A1) is the larger, more common size at roughly 11 by 5.5 by 7.25 inches and about 4.87 pounds empty, holding up to 800 rounds of 5.56 or a much larger volume of bulk gear, food, or electronics.
Should I buy steel military surplus or plastic ammo cans?
Steel surplus cans (M2A1, M19A1) are the toughest option and the cheapest per unit of protection, but they are heavier, can rust over decades if the paint chips, and used ones vary in gasket condition by grade. Plastic cans like MTM Case-Gard are roughly half the weight of steel, will never rust, and use a fresh O-ring every time, which makes them the better pick for a bug-out bag you will actually carry on foot. For a stationary cache buried, shelved, or stored in a garage, steel's lower cost per can and abuse resistance usually wins.
What should I actually store in an ammo can besides ammunition?
Ready.gov specifically recommends keeping copies of insurance policies, identification, and bank account records in a waterproof, portable container as part of a family emergency kit, and a sealed ammo can is a common, inexpensive way to meet that. Beyond documents, preppers commonly use them for fire-starting kits, seed storage, a compact first-aid cache, ham radio gear, or matches and lighters — anything that needs to survive flooding, humidity, or being buried without degrading.
Conclusion: Which Ammo Can Should You Buy?
For most preppers, a U.S. Military Surplus M2A1 .50 Cal Steel Can is the smartest buy — genuine mil-spec durability at a fraction of new price. Want something lighter to actually carry? The MTM Case-Gard AC50C is the better pick. Need one today from a local store? Grab a Plano Field Ammo Box. For documents and small valuables, size down to an M19A1 .30 Cal, and if you're building out a full cache system, buying surplus cans in a multi-pack gets your cost per can down.
Watertight storage is one small piece of a resilient setup. Round it out with our guides to the best bug-out bag, the best first aid kit, and long-term food storage for the systems that keep your supplies dry and organized.