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English definition of “knapsack”

knapsack

noun [C] uk   /ˈnæp.sæk/ UK old-fashioned or US us  
a bag carried on the back or over the shoulder, used especially by people who go walking or climbing for carrying food, clothes, etc.Containers for carrying personal possessions
(Definition of knapsack from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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