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From The Collaborative International Dictionary of English v.0.48:
Knapsack \Knap"sack`\, n. [D. knapzak; knappen to eat + zak a bag. See Knap, v. t., and Sack.] A case of canvas, leather, nylon, or other sturdy fabric, fitted with straps, for carrying on the back the food, clothing, or other supplies for a soldier or a traveler; as, to hike up the mountain with lunch in a knapsack. [1913 Webster +PJC] And each one fills his knapsack or his scrip With some rare thing that on the field is found. --Drayton. [1913 Webster]