An alternative to the sometimes hard to come by, and always distinctive looking ammo can is to use a plain old gallon paint can....it's waterproof, cheap, nondescript (doesn't scream AMMO CAN), etc.
If you want to put some extra protection on it, spraying it with underseal would do.
Emergency Medicine - saving the world from themselves, one at a time.
"Thou shalt not be a victim, thou shalt not be a perpetrator, but, above all, thou shalt not be a bystander."
I make the ADL soil themselves. And that makes me very happy