Some old military cans work fine. No need to buy a bunch of pricey ammo cans that work just as good. Any military surplus place will have them. .30cal and .50 bmg cans. Might even find some 20mm cans. I have seen the .50 go for $14-$18. You can find them online also. Even at flee markets. Just make sure the seal is still good. I rub some petroleum jelly on the seals. Just to keep them from drying out.