A bag or case of leather, canvas, nylon, etc. worn on the back, as by soldiers or hikers, for carrying equipment or supplies.
Webster's New World
To go hiking while burdened with a knapsack, usually overnight (longer.)
My sleeping bag fell off my backpack into the water, while we were knapsacking up the mountain.
Other Word Forms of Knapsack
Origin of Knapsack
Probably Low German Knappsack knappen to bite (probably of imitative origin) Sack bag (from Middle Low German sak) (from Old High German sac) (from Late Latin saccus sack1)
From American Heritage Dictionary of the English Language, 5th Edition
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