Definition from Wiktionary, the free dictionary
knapsack (plural knapsacks)
- (US) A case of canvas or leather, for carrying items on the back.
- (cryptography) A set of values from which a subset is chosen.
- To go hiking while burdened with a knapsack, usually overnight (or longer.)
- My sleeping bag fell off my backpack into the water, while we were knapsacking up the mountain.