Backpack
/bˈæˌkpæk/
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Definition
(noun) A knapsack, sometimes mounted on a light frame, but always supported by straps, worn on a person’s back for the purpose of carrying things, especially when hiking, or on a student's back when carrying books.
Sentence Examples
If you can't lift your backpack, then you can't carry it!
Does this backpack belong to him?
CEFR Practice Quiz
He carried all his camping gear in a heavy blue ____ on his back.