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backpack /ˈbækˌpæk/  

  • noun
    plural -packs
    [count] chiefly US :a bag for carrying things that has two shoulder straps and is carried on the back - called also (chiefly US) knapsack, (chiefly Brit) rucksack;
    verb
    -packs; -packed; -packing
    [no obj] :to hike or travel with a backpack