backpack backpack /ˈbækˌpæk/

noun

1. A bag carried by a strap on your back or shoulder  ( back pack , backpack , packsack , haversack , knapsack , rucksack )
   a bag carried by a strap on your back or shoulder
    My daughter's backpack is pink and covered in unicorns
   My daughter's backpack is pink and covered in unicorns
   
   

verb

1. (sport) hike with a backpack  ( backpack , pack )
   (sport) hike with a backpack
    Every summer they are backpacking in the Rockies
   Every summer they are backpacking in the Rockies