(chiefly 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 for longer.

plural of knapsack

Third-person singular simple present indicative form of knapsack

simple past tense and past participle of knapsack

Wearing a knapsack.

present participle of knapsack