backpack

[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

backpacker, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
backpack (ˈbækˌpæk)
 
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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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
He jumped from the plane with a machine gun in his hands and a tuxedo in his
  backpack.
Wearers' feet go into boots attached to a series of metal tubes that run up a
  leg to a backpack.
The device transfers the backpack's payload from the back of the wearer to the
  ground.
The whole thing is small enough to fit into a small backpack and can run on
  batteries as well as on the mains.
Synonyms
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