a canvas, nylon, or leather bag for clothes, food, and other supplies, carried on the back by soldiers, hikers, etc.

1595–1605; < Low German knappsack, equivalent to knapp a bite (of food) + sack sack1; compare dialectal English knap to snap up, eat greedily

knapsacked, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
knapsack (ˈnæpˌsæk)
a canvas or leather bag carried strapped on the back or shoulder
[C17: from Low German knappsack, probably from knappen to bite, snap + sack bag; related to Dutch knapzak; see sack1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1600, from Low Ger. Knapsack (Du. knapzak), probably from knappen "to eat" lit. "to crack, snap" + Sack "bag."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The knapsack was taken to the precinct with the defendant.
The next morning, appellant discovered that his car had been broken into and
  the knapsack and its contents stolen.
He shuffles dog-eared bits of paper from a shabby file in his knapsack and
  writes down the questions he is asked.
Or stick a copy in your knapsack and pull it out on your next camping trip.
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