Ammo boxes get sold as "waterproof" a lot more often than they're actually tested for it. This guide ranks the real options by what waterproof rating means in practice, not on the tin.
Best overall: the genuine steel ammo tin for anyone storing kit in a wet camp, a damp shed or a bug-out box. Best for gear you can't afford to get wet: a Pelican-style hard case, the only category here with a manufacturer-published IP67 rating. Best budget option: an MTM plastic ammo box for range days and reloading components. Skip for wet storage: a wooden ammo crate — it looks the part on a shelf but does nothing against rain.
- Genuine steel ammo tins win on ammo boxes waterproof rating for general storage because the rubber gasket seals when the lid latch is closed properly.
- Pelican-style hard cases are the only ammo box style with a published IP67 rating, worth it for radios, optics and cameras.
- MTM plastic ammo boxes resist splash and rain but aren't built for submersion — fine for a range bag, not a flooded cellar.
- Wooden ammo crates have zero waterproof rating and are for decor, not wet kit storage.
Why this matters
Most sellers write "waterproof" on an ammo box listing and leave it there. In 2026, the term still isn't regulated for surplus tins the way it is for dive gear or phone cases, so the rating on the label often means nothing at all.
A genuine .50 cal ammo tin earns its watertight reputation because of a physical seal, not a certificate. The steel body and rubber gasket were built to MIL-SPEC standards to keep ammunition dry in transit and storage, and that same seal works just as well on camping kit, tools or documents. That's a different thing to an IP-rated hard case, and worth knowing before you buy either.
What makes the best waterproof ammo box
- Seal type — rubber gasket versus a snap-fit lid versus no seal at all
- Material — steel resists impact and UV better than plastic over years of outdoor use
- Latch integrity — a worn latch means the seal never closes fully, rating or no rating
- Published rating — an actual IP number from the manufacturer beats a marketing claim
- Size for the job — a box rated for splash-proof storage is wasted on documents that never leave a shelf
- Condition if buying surplus — genuine, used or NOS gaskets perish differently and need checking
At a glance
| Box type | Best for | Standout feature | Key limitation |
|---|---|---|---|
| Genuine steel ammo tin | General wet-weather storage | Rubber gasket seal, MIL-SPEC build | No official IP number, seal needs checking |
| Pelican-style hard case | Electronics and optics | Published IP67 rating | Bulkier, heavier for the same capacity |
| MTM plastic ammo box | Range day and reloading kit | Light, cheap, snap latches | Not rated for submersion |
| Wooden ammo crate | Decor, planters, furniture builds | Genuine military look | No waterproofing at all |
1. Genuine steel ammo tin: best waterproof ammo box for general storage
The classic .50 cal steel ammo tin does one job well: it keeps water, dust and damp out once the lid latch is fully closed. The rubber gasket running around the lid does the actual sealing work, not the steel shell itself.
Genuine surplus tins vary in grade — used, graded, or new old stock — and the gasket is the part that ages fastest. Check it for cracking or flattening before you trust a used tin with anything that matters.
Steel ammo tin pros:
- Rubber gasket gives genuine watertight performance when the lid is fully latched
- Steel body shrugs off impacts and UV that would crack plastic over a few seasons
- Widely available as genuine surplus in various grades
Steel ammo tin cons:
- No manufacturer-published IP rating — you're trusting the seal, not a spec sheet
- Heavier than a plastic equivalent for the same volume
- Surplus gaskets on older or heavily used tins can perish
Steel ammo tin verdict: Buy for general wet-weather storage where a physical seal matters more than a certificate.
2. Pelican-style hard case: best ammo box for electronics and optics
Hard cases built to the same rotomoulded standard as Pelican's own range carry a published IP67 rating — the only category on this list with an actual third-party-verifiable number attached. That rating means dust-tight and able to survive temporary submersion, which matters when the contents are a radio, a scope or a camera rather than tinned rations.
Hard case pros:
- Published IP67 rating gives a real, checkable waterproof claim
- Foam inserts protect fragile electronics and optics in transit
- O-ring seal is designed and tested, not improvised from a military spec
Hard case cons:
- Bulkier and heavier than a steel ammo tin of similar capacity
- Overkill for basic dry storage like paperwork or spare clothing
- Latches need periodic inspection just like any sealed case
Hard case verdict: Buy if you're storing anything that dying from water damage would actually cost you.
3. MTM plastic ammo box: best budget option for range day and reloading kit
MTM-style plastic ammo boxes use snap latches and a moulded lip rather than a true gasket. They handle rain and splash fine on a range bench or in a garage, but they aren't built or rated for submersion.
Plastic ammo box pros:
- Light enough to carry a full load of ammunition or components without strain
- Cheap enough to buy several for different calibres or projects
- Clear or coloured lids make sorting reloading components faster
Plastic ammo box cons:
- No true waterproof rating — splash-resistant at best
- Plastic gets brittle in UV and cold over a few winters outdoors
- Latches can pop under load or impact
Plastic ammo box verdict: Buy for the range bag and reloading bench, Skip if it's going to live outdoors year-round.
4. Wooden ammo crate: best for decor and furniture, not wet storage
Wooden ammo crates look the part and turn up constantly in garden planter builds and upcycled furniture projects. They carry zero waterproofing whatsoever — the timber is untreated on most surplus crates and will rot if left exposed.
Wooden crate pros:
- Genuine military look for shelving, coffee tables or plant boxes
- Sturdy build for a static, indoor or covered use
- Cheaper per litre of storage than steel or hard cases
Wooden crate cons:
- No waterproofing at all — untreated timber absorbs moisture
- Not suitable for anything that needs to stay dry outdoors
- Weight and size make it a poor choice for portable storage
Wooden crate verdict: Skip for anything that needs to survive weather; Buy for decor and build projects indoors or under cover.
“A steel ammo tin only stays watertight while the rubber gasket is intact and the lid is fully latched.”
How we ranked these
Each box was judged against the six criteria above: seal type, material, latch integrity, published rating, size fit, and condition where the item is sold as surplus. The genuine steel tin and the hard case both scored well on seal type and material; the plastic box and wooden crate lost points on published rating and, in the crate's case, on having no seal at all. If you're still working out how to choose the right ammo box size for what you're storing, sort that before the waterproof question — an oversized tin with dead air space actually holds more condensation, not less.
Which waterproof ammo box should you choose?
For most people storing kit, documents or camping gear in 2026, the genuine steel ammo tin is the right default — it's the option with a real physical seal and no compromise on durability. Reach for a Pelican-style hard case only when the contents are electronics or optics that a soaked seal would ruin outright. Grab an MTM plastic box for the range bag, not the shed. And treat a wooden ammo crate as furniture, never as weatherproof storage.
FAQ
What's the best waterproof ammo box in 2026?
A genuine steel ammo tin with an intact rubber gasket is the best all-round waterproof ammo box in 2026 because the seal is physical, not a marketing claim. A Pelican-style hard case beats it only when the contents are electronics or optics that need a published IP rating.
Are army surplus ammo tins actually watertight?
Yes, as long as the rubber gasket around the lid is intact and the latch closes fully. Surplus tins sold as used or graded should have the gasket checked before you trust them with anything moisture-sensitive.
What waterproof rating does a Pelican-style case have?
Pelican publishes an IP67 rating on its own cases, meaning dust-tight and able to survive temporary submersion. Rotomoulded hard cases built to the same standard carry the same rating.
Can you use an ammo box for camping in the rain?
A genuine steel ammo tin handles rain and wild camp conditions well because of its gasket seal. A wooden crate or an unrated plastic box will not keep contents dry in the same conditions.
Are plastic MTM-style ammo boxes waterproof?
No, plastic ammo boxes with snap latches resist splash and light rain but aren't rated or built for submersion. They're better suited to a range bag than outdoor storage.
Is a wooden ammo crate waterproof?
No, wooden ammo crates carry no waterproofing at all and untreated timber will rot if left exposed. They're best used for decor, planters or furniture builds indoors or under cover.
How do you know if an ammo tin's seal still works?
Check the rubber gasket for cracking, flattening or gaps around the full circumference of the lid. If the latch doesn't pull the lid down evenly, the seal won't close properly even if the gasket looks fine.
What's the difference between water-resistant and waterproof?
Water-resistant means a box handles splash or light rain, which describes most plastic ammo boxes. Waterproof means it can be submerged or exposed to sustained wet conditions without letting water in, which describes a gasket-sealed steel tin or an IP-rated hard case.
One last thing
The gasket is the whole story with a steel ammo tin — the steel body is just a shell around a rubber seal doing the actual work, and that seal is the one part worth inspecting before you buy any surplus tin in 2026, genuine or not.
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