Etymology
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rucksack (n.)

"backpack, bag carried on the back by walkers," 1866, from German Rucksack, from Alpine dialect Rück "the back" (from German Rücken; see ridge) + Sack "sack" (see sack (n.1)).

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Definitions of rucksack

rucksack (n.)
a bag carried by a strap on your back or shoulder;
Synonyms: backpack / back pack / knapsack / packsack / haversack
From wordnet.princeton.edu