Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Low German
Origin: knappsack or Dutch knapzak 'food bag'

knapsack

 noun
     
knap‧sack [countable] American English
DL a bag that you carry on your shoulders [= backpack, rucksack]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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