back·pack

[bak-pak]
noun
1.
a pack or knapsack, often of canvas or nylon, to be carried on one's back, sometimes supported on a lightweight metal frame strapped to the body.
2.
a piece of equipment designed to be used while being carried on the back.
verb (used without object)
3.
to go on a hike, using a backpack: We went backpacking in the Adirondacks.
verb (used with object)
4.
to place or carry in a backpack or on one's back.

Origin:
1910–15, Americanism; back1 + pack1

back·pack·er, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
backpack (ˈbækˌpæk) [Click for IPA pronunciation guide]
 
n
1.  a rucksack or knapsack
2.  a pack carried on the back of an astronaut, containing oxygen cylinders, essential supplies, etc
 
vb
3.  (intr) to travel about or go hiking with a backpack
4.  (tr) to transport (food or equipment) by backpack
 
'backpacker
 
n
 
'backpacking
 
n

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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00:10
Backpack is one of our favorite verbs.
So is fletcherise. Does it mean:
to flee; abscond:
to chew (food) slowly and thoroughly.
Etymonline
Word Origin & History

backpack
1914 as a noun, 1916 as a verb, from back + pack.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Scientists have invented a backpack that creates enough electricity to power
  seven portable gadgets at once.
The backpack folds into its own diaper bag for storage and travel.
Wearers' feet go into boots attached to a series of metal tubes that run up a
  leg to a backpack.
It even fit into my larger purse and no doubt would fit fine in a backpack
  without any special cushioning.
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