a military repo ration outfit sells these in a Altoids
style box with some sort of WW2 label..and a refill tube
comes with it..they say something like "survival tabs..as
in keeps you alive but expect to be hungry" or something
like that..i would think if you were in a life raft or
not active in some sort of shelter..basement..cave..??
and had nothing else these would keep you from not
starving as fast as nothing at all..