[ruhk-sak, rook-]
a type of knapsack carried by hikers, bicyclists, etc.

1890–95; < German: literally, back sack Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rucksack (ˈrʌkˌsæk)
US and Canadian name: backpack a large bag, usually having two straps and a supporting frame, carried on the back and often used by climbers, campers, etc
[C19: from German, literally: back sack]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1866, from Ger. Rucksack, from Alpine dialect Rück "the back" (from Ger. Rücken) + Sack "sack."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He would whip out a belt-mounted computer, unsling his rucksack, and scan the
  bookcase in one quick motion.
Some can be pulled from a rucksack and launched by hand.
In his rucksack he carried, besides pencils and notebooks, poetry.
Willy soon spotted me, slowed down, and momentarily gave the impression that he
  might remove his rucksack and chat for a while.
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