plural knapsacks
Definition of knapsack
: a bag (as of canvas or nylon) strapped on the back and used for carrying supplies or personal belongings : backpack sense 1a(2)
But the 12-year-olds were dumping landslides of books into knapsacks and getting ready to leave, and all I could do was follow them out through the turnstiles and into the start of another summer.— Meg Wolitzer He had a Polaroid camera around his neck and a knapsack on his back.— Brian Selznick
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Merriam-Webster unabridged
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Time Traveler for knapsack
The first known use of knapsack was in 1599
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