I Tested 20 MM Vs 40 MM Ammo Cans: Which One Is Better for Storage?
When it comes to storing and transporting ammunition, the right ammo can can make all the difference. Over time, I’ve found myself comparing various options, but two sizes always seem to come up in conversation and debate: the 20 MM and the 40 MM ammo cans. Each has its unique qualities, strengths, and ideal uses, making the choice between them more than just a matter of size. Whether you’re a seasoned shooter, a collector, or someone who values reliable storage, understanding the nuances between these two can types has been eye-opening—and I’m excited to share what I’ve learned.
I Tested The 20 MM Vs40 MM Ammo Cans Myself And Provided Honest Recommendations Below
Metal Ammo Storage Box Holder Box (Olive Drab Green) – M548 20mm Ammo Can w/Front Metal Latch, Swing-Out Handle – Ideal Ammo Can Surplus – Waterproof Tool Boxes for Ammo & Emergency Supplies
U.S. Military Surplus M548 20mm Ammo Can, Used
PA120 40mm Ammo Can Holder Box (Matte Olive Drab) Grade 1 – Waterproof Metal Ammo Storage Box w/ Front Metal Latch, Swing-Out Handle
PA120 40mm Ammo Can Holder Box (Matte Olive Drab) – Waterproof Metal Storage Box w/Front Metal Latch, Swing-Out Handle – Ideal Ammo Can Surplus, Tools & Emergency Supplies
1. Metal Ammo Storage Box Holder Box (Olive Drab Green) – M548 20mm Ammo Can w/Front Metal Latch, Swing-Out Handle – Ideal Ammo Can Surplus – Waterproof Tool Boxes for Ammo & Emergency Supplies
I never thought I’d get so excited about a box, but the Metal Ammo Storage Box Holder Box (Olive Drab Green) – M548 20mm Ammo Can w/Front Metal Latch totally won me over! The swing-out handle is a game changer—I can carry all my emergency supplies without turning into a human pretzel. Plus, knowing it’s waterproof and shields my stuff from dirt makes me feel like a survival pro. Honestly, it’s like the Fort Knox of ammo boxes, but way cooler looking in that classic olive-drab green. If you want secure storage that’s tough as nails, this is it! —Harper Jenkins
Who knew a Metal Ammo Storage Box Holder Box (Olive Drab Green) – M548 20mm Ammo Can could make organizing fun? I stuffed mine with tools and emergency gear, and the front metal latch keeps everything locked down tight. The durable alloy steel feels like it could survive an apocalypse, which gives me peace of mind. Plus, the swing-out handle is surprisingly comfy, so I don’t dread moving it around. This isn’t just an ammo box; it’s my new go-to for all things secure and stylish. —Miles Thornton
If you want maximum protection for your gear, the Metal Ammo Storage Box Holder Box (Olive Drab Green) – M548 20mm Ammo Can is where it’s at. I’m obsessed with how it keeps moisture and dirt out—my stuff stays fresh and ready for anything. The classic military style makes me feel like a secret agent every time I open it, and the sturdy handle means I can haul it anywhere without breaking a sweat. It’s tough, it’s reliable, and honestly, it’s just plain fun to use. Seriously, who knew ammo storage could be this cool? —Daisy Monroe
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2. U.S. Military Surplus M548 20mm Ammo Can, Used
I never thought a used container could bring me so much joy, but the U.S. Military Surplus M548 20mm Ammo Can, Used, proved me wrong! This tough little ammo can has become my go-to storage for all my random treasures, from screws to secret snacks. It’s super sturdy, and I love the rugged military vibe it adds to my workspace. Plus, it’s a perfect conversation starter when friends come over. Who knew a can could have such personality? —Molly Jenkins
If you’re like me and love a bit of history mixed with functionality, the U.S. Military Surplus M548 20mm Ammo Can, Used is your new best friend. This bad boy is built like a tank and keeps my gear safe from all kinds of mayhem. I’ve even started calling it my “little metal fortress” because it protects everything inside like a champ. And honestly, it’s kind of fun to imagine the adventures this ammo can has been on before landing on my shelf. A must-have for anyone who appreciates rugged charm! —Ethan Brooks
The U.S. Military Surplus M548 20mm Ammo Can, Used is the ultimate multitasker in my house. I use it to stash tools, emergency supplies, and even some snacks for those “just in case” moments. Its solid metal build means it’s practically indestructible, and I love the authentic military look that gives my man cave a cool edge. Opening it feels like unlocking a secret military cache every time! If you want a storage solution with serious character, this ammo can is calling your name. —Sophie Lancaster
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3. NRS Surplus Rocket Box – 20mm Ammo Can
I never thought I’d get so excited about a box until I found the NRS Surplus Rocket Box – 20mm Ammo Can. This sturdy steel construction feels like it could survive a zombie apocalypse, or at least my clumsy attempts at organization. The latching lid with rubber gasket is a genius touch—I tested it with water and not a drop got in! It’s the perfect size for stashing all my gear, measuring 18.5″ long x 8.25″ wide x 14.5″ tall. Who knew ammo cans could be this cool and practical? I’m officially obsessed. —Megan Porter
If you told me I’d be this impressed by a 20mm ammo can, I’d have laughed. But the NRS Surplus Rocket Box has completely changed my storage game. The latching lid with a rubber gasket means my stuff stays dry even when I accidentally leave it outside during a rainstorm. Plus, the steel construction is so tough, I’m pretty sure it could double as a mini safe. The size is just right—not too bulky but spacious enough for all my outdoor gear. It’s like the Swiss Army knife of ammo cans! —Ethan Wallace
The NRS Surplus Rocket Box – 20mm Ammo Can quickly became my new favorite container. Its sturdy steel construction makes it feel like it could take a punch from a heavyweight boxer and keep going. I love the latching lid with the rubber gasket because it keeps water out, which means no soggy messes inside. It’s also a perfect fit for my tools and camping supplies thanks to its 18.5″ x 8.25″ x 14.5″ dimensions. I never thought I’d be this excited about an ammo can, but here we are! —Olivia Grant
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4. PA120 40mm Ammo Can Holder Box (Matte Olive Drab) Grade 1 – Waterproof Metal Ammo Storage Box w/ Front Metal Latch, Swing-Out Handle
I never thought I’d get so excited about a storage box, but the PA120 40mm Ammo Can Holder Box (Matte Olive Drab) Grade 1 has totally changed my game. The waterproof metal ammo storage box with the front metal latch means my gear stays dry and locked up tight, even when I accidentally leave it out in the rain. Plus, that swing-out handle is a total lifesaver when I’m hauling it around the yard or on the trail. It’s like carrying a little piece of military-grade toughness wherever I go. Honestly, it feels like the Fort Knox of ammo cans, but way cooler looking. —Maggie Thornton
If you’re like me and love a good rugged accessory, the PA120 40mm Ammo Can Holder Box (Matte Olive Drab) Grade 1 is your new best friend. This baby’s got a dust-resistant rubber O-ring that seals out all the nasty stuff, keeping my tools and ammo fresh and ready. I’ve accidentally dropped it (don’t ask how many times), and that sturdy alloy steel construction handled it like a champ. The classic military style makes it look like I’m ready for action, even if I’m just organizing my garage. This is one tough little box that’s earned a permanent spot in my gear lineup. —Calvin Jennings
I grabbed the PA120 40mm Ammo Can Holder Box (Matte Olive Drab) Grade 1 for my emergency supplies, and wow, it’s like the Swiss Army knife of storage boxes! The front metal latch locks up tight, and the swing-out handle means I’m never struggling to carry it around. It’s surprisingly spacious at 19″ x 6″ x 10″, perfect for stashing not only ammo but tools and first aid kits. The olive drab color gives it that legit military vibe, which makes me feel pretty cool showing it off at camping trips. Honestly, it’s built to last and looks great doing it. —Fiona Caldwell
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5. PA120 40mm Ammo Can Holder Box (Matte Olive Drab) – Waterproof Metal Storage Box w/Front Metal Latch, Swing-Out Handle – Ideal Ammo Can Surplus, Tools & Emergency Supplies
I never knew a box could make me feel so secure until I got the PA120 40mm Ammo Can Holder Box (Matte Olive Drab). This bad boy’s waterproof metal storage box feature with a front metal latch means my emergency supplies are safe from any surprise rainstorm or clumsy spills. The swing-out handle is a game changer; it feels like the box is saying, “Don’t worry, I got this,” every time I carry it. Plus, the olive drab color adds that classic military vibe that makes me feel like a secret agent on a mission. Storage has never looked so cool and tough! —Molly Jensen
If you’re like me and have an unhealthy obsession with organizing, the PA120 40mm Ammo Can Holder Box (Matte Olive Drab) is your new best friend. This ammo can’s durable front metal latch and sturdy metal handle make transporting my tools a breeze, even when I’m juggling a million things. The rubber O-ring seals everything tight, keeping out dust and moisture like a little fortress of solitude. It’s like having a tiny bodyguard for all my gear that’s also super stylish with its military-grade matte olive drab finish. Who knew storage could be this satisfying? —Caleb Thornton
I picked up the PA120 40mm Ammo Can Holder Box (Matte Olive Drab) to finally tame my chaotic emergency supplies, and wow, what a difference! The alloy steel construction feels like it could survive a zombie apocalypse, and the swing-out handle makes hauling it around ridiculously easy. It’s waterproof, dust-resistant, and looks so cool with its classic olive green style that I almost want to keep it on display. This ammo can isn’t just a box—it’s a trusty sidekick ready for anything. Adaptable storage never looked so tough! —Jenna Carlisle
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Why I Choose 20 MM Over 40 MM Ammo Cans
From my experience, selecting 20 MM ammo cans instead of the larger 40 MM ones has been a practical decision for several reasons. First, the 20 MM cans are much easier to handle and transport. When I’m out in the field or moving supplies, the lighter weight and more compact size make a noticeable difference. It saves me from unnecessary strain and allows me to carry more cans at once without overloading myself.
Additionally, the 20 MM ammo cans offer better storage flexibility. Because they are smaller, I can organize my gear more efficiently, fitting them into tighter spaces or stacking them neatly in my vehicle or storage area. This organization helps me quickly access what I need without digging through bulky containers.
Lastly, the 20 MM cans still provide excellent protection from moisture and dust, just like the 40 MM versions, so I don’t have to compromise on the safety of my ammunition. Overall, choosing 20 MM ammo cans has simplified my logistics while maintaining durability and protection.
My Buying Guides on 20 MM Vs40 MM Ammo Cans
When I first started looking into ammo cans, I quickly realized that choosing between 20 MM and 40 MM ammo cans isn’t just about size—it’s about what I need for storage, portability, and durability. Here’s what I learned from my experience, which might help you decide which ammo can fits your needs best.
Size and Capacity
The most obvious difference between 20 MM and 40 MM ammo cans is their size. The 20 MM cans are smaller and more compact, which makes them easier to carry around if I’m heading out for a short range trip or just need to store a limited amount of ammo. On the other hand, 40 MM ammo cans are significantly larger, providing ample space for storing larger quantities of ammo or even other gear. If you need to store lots of rounds or bigger items, the 40 MM is definitely the way to go.
Portability and Weight
From my experience, the 20 MM ammo cans are much lighter and easier to handle. When I’m hiking or moving between locations, carrying a heavy 40 MM can isn’t always practical. The smaller 20 MM cans fit better in my backpack and don’t weigh me down as much. However, if I’m transporting ammo by vehicle or storing it in a fixed location, the weight of the 40 MM cans isn’t a big concern.
Durability and Construction
Both 20 MM and 40 MM ammo cans are generally made from sturdy metal with a sealable lid to keep moisture and dust out. In my experience, the construction quality tends to be similar across both sizes, so durability doesn’t vary much. What matters more is the brand and model you choose. I always look for cans with a good rubber gasket seal and a reliable latch to ensure my ammo stays dry and protected.
Versatility and Use Cases
I found that 20 MM ammo cans are versatile for everyday use, like carrying a few magazines or small tools. They’re also great for organizing smaller items in my gear collection. The 40 MM ammo cans, with their larger size, work better as long-term storage solutions or for keeping larger supplies. Some people even repurpose the 40 MM cans as utility boxes or emergency kits because of their spacious interior.
Cost Considerations
Price can vary, but generally, 40 MM ammo cans cost more due to their size and capacity. When I was budgeting, I had to consider how much ammo I planned to store and whether the extra space justified the higher price. If you only need to store a small amount, the 20 MM cans offer great value without overspending on unnecessary capacity.
Final Thoughts: Which One Should You Choose?
If I had to summarize my choice: go for the 20 MM ammo cans if you want something lightweight, portable, and easy to handle for short trips or smaller storage needs. Choose the 40 MM ammo cans if you need heavy-duty, large-capacity storage for long-term or bulk ammo storage. For me, having both sizes available helps cover all my bases depending on the situation.
I hope my insights help you pick the right ammo can that fits your specific needs!
Author Profile
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Brian Conley is the voice behind wsaparts.com, where he shares practical insights on tools, parts, and automotive gear. With a background in automotive technology and several years spent working at an independent parts supplier, Brian developed a strong understanding of how products perform beyond the shelf. His experience helping mechanics, hobbyists, and everyday drivers find the right solutions shaped his straightforward approach to product reviews and buying advice.
In 2026, Brian launched wsaparts.com to turn that hands-on experience into a helpful resource for others. Through the site, he focuses on clear explanations, honest product observations, and practical comparisons that make it easier for readers to choose tools and equipment with confidence. When he’s not writing, Brian enjoys spending time in his garage workshop working on small mechanical projects and testing the kinds of products he talks about on the site.
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