This is just my opinion . . . but I like ammo cans. I have yet to find an ammo can that is broken or has let in water versus plastic containers . . . although I will admit that some have been in better condition than others. I've also seen drinking coolers (Thermos) used with good results and at least one cacher has used a mortar tube (it's water-proof, but a bit bulky and could possibly be confused with an IED -- the key to me is where such a thing is placed . . . placing it near a very public place is a very bad idea whereas placing something like this in middle of the woods would work much better . . . and of course marking the container as a cache container for the would-be bomb squad is always a good idea when possible.)
Containers that seem to be poor cache containers are cheaper plastic containers, plastic mayonaise/school cafeteria jars, plastic paint buckets and beer kegs . . . Hiram always seems to be FTF to those for some reason.
"Courage is not the absence of fear, but the realization that there is something more important than fear."
"Death is only one of many ways to die."