Military Surplus Ammo Cans or New Plastic Dry Boxes, which is the best? That depends on whom you askâ€¦ Hopefully this will point out the pros and cons of each, so you can make a better decision on what to store youâ€™re ammo in. In this comparison we have a Flambeau Plastic Dry Box, which you can pickup at your local Wal-Mart for around $10 in the camping section. Then we have a .50Cal Steel Military Ammo Can that run around $5-$7* at your local Military Surplus store. *-Prices are on the rise for military ammo boxes. Here is what Cheaperthandirt has listed on their site. "Original Military Ammo Cans. The U.S. Military has begun destroying ammo cans making them very scarce." http://www.cheaperthandirt.com/ZAA095-566-1375.html There are some myths about steel conducting moisture and plastic does not. Truth is neither will â€œconductâ€ moisture. Steel will conduct heat more so than plastic and will take longer to heat up or cool down. Both will condense (sweat) moisture if they are moved from one temperature extreme to another. However if the seals are good it canâ€™t condense more moisture than whatâ€™s already present inside the box to begin with. To combat moisture you can add some desiccant packs to your boxes for extra protection. As you can see the Flambeau is a little bigger, and even comes with a removable tray. The Flambeau also has a rubber gasket for a seal. This is a good thing as some plastic boxes only have a thin flimsy piece of weather stripping for a seal. You want to stay away from the later, as it will not provide good long-term protection for your ammo. The latch on the Flambeau is all plastic. Because of this it canâ€™t provide the clamping power of the steel military latches. The greater pressure that can be applied the better the seal. When picking out a Military Surplus Box. Take a second to check the seals. Make sure they are in good condition with no cracks or massive amounts a globed on paint. They can usually be cleaned up with a little Armor All like this one. So how good are the seals? - Enter the WATER TEST! This is a very extreme test, as you will not be storing your ammo at the bottom of a lake. It is only a test to compare the seals of the two boxes. Both boxes will be filled with clumping kitty litter (fresh) and if any water does get in the box. The litter should be a tell tell sign. First here are the two boxes and the litter that will be used. I have also enlisted the help of an assistant who is not only an expert on kitty litter; he hates water more than our ammo! First I filled the plastic box with litter. Then it takes the plunge. I had to add some extra weight to get it to sink. It wasnâ€™t in the water long before I noticed little bubbles coming from the rear hinge of the box. I pulled it from the water, check the litter and found nothing. So I put it back in the tub for a little longer an ignored the bubbles. Ten minutes later I pull the box out of the water and this time I could see where some water did get in. Not a lot, but a little did make it in. Next it was time for the Military Ammo Can. Luckily it was heavy enough to sink all on its own. I let it stay submerged for 30minutes. When I pulled it out there was no sign that any water got in. Conclusion: Truth is either box should provide adequate protection. Itâ€™s really more of a personal preference to what you use. I attribute the steel military can doing better in the water test simply due to the amount of pressure the latch clamps down with.