Mice..i left my car at a remote canoe landing for 2 weeks
and while i was away mice had found a way into the car and
nibbled thru a MRE i left under the seat in case i arrived
back hungry..they not only ate thru the heavy outter pack
but found and made it into the cracker and fruit cake--cherry
nut--no loss there...but that they could find a way in and
smell thru several layers of plastic was a surprize..if you
live in "mouse country" i would suggest keeping stored rations
in very well sealed containers..