Sack up

I've gone hiking in bear country before, and a standard practice there is to hang your food (and the clothes you wore while cooking!) up in a tree, some distance from your camp, so that you don't invite bears into your tent.

(The reason that you hang the clothes you've cooked in, and don't sleep in them, is that if a bear wanders into your camp at night, you, smelling of food, in your sleeping bag, will appear to be something that was packaged by Kraft.)

Anyway... meet Ursack.