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;
And each one fills his knapsack or his scrip
With some rare thing that on the field is found. Drayton. [ 1913 Webster ]