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backpack (n.)

also back-pack, 1904, "bag with shoulder straps that allow it to be carried on a person's back," from back (n.) + pack (n.). By 1916 as a verb, "to hike while carrying supplies in a backpack." Related: Backpacked; backpacking.

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Definitions of backpack from WordNet
1
backpack (v.)
hike with a backpack;
Every summer they are backpacking in the Rockies
Synonyms: pack
2
backpack (n.)
a bag carried by a strap on your back or shoulder;
Synonyms: back pack / knapsack / packsack / rucksack / haversack
From wordnet.princeton.edu