Definition of knapsack noun from the Oxford Advanced Learner's Dictionary

 

knapsack

 noun
noun
BrE BrE//ˈnæpsæk//
 
; NAmE NAmE//ˈnæpsæk//
 
(old-fashioned or North American English)
 
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a small rucksack He had walked into the school yard that morning with his knapsack on his back and his lunchbox in his hand. Word Origin early 17th cent.: from Middle Low German, from Dutch knapzack, probably from German knappen ‘ to bite’ + zak ‘sack’.
See the Oxford Advanced American Dictionary entry: knapsack