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The Collaborative International Dictionary of English v.0.48 (gcide)

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]