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plural knapsacks
(chiefly US) A case of canvas or leather, for carrying items on the back. quotations examples
The two elder reluctantly left him and walked on, taking their brother's knapsack to relieve him in following, and the youngest entered the field.
1891, Thomas Hardy, Tess of the d'Urbervilles, volume 1, London: James R. Osgood, McIlvaine and Co., page 23
(cryptography) A set of values from which a subset is chosen. examples
third-person singular simple present knapsacks, present participle knapsacking, simple past and past participle knapsacked
To go hiking while burdened with a knapsack, usually overnight or for longer. examples