I am an avid target shooter besides being new to geocaching(of course I can't shoot worth a darn but I enjoy it). I just ordered a descent quantity of 22LR's for my rifle from Cabela's and for every 500 rounds I got a free plastic ammo box, which is larger than the large size metal ammo boxes. It comes with a seal, but the seal is not in place so I put the seal in place, stuck one of my dog toys inside of it and headed out on the deck with the hose and went to town testing it. I hit it in every direction with shower, spray, and power wash, I laid it on it's side, upside down, and right side up, not a drop on the inside when I opened it up after drying with a towel. I just thought I'd put a note out there as this may be a good and cheap idea for all of you who are into shooting also(especially since prices on ammo are going up about 20% this month too). Be safe and have fun.