A backpack is a cloth sack carried on one's back and secured with straps.
Backpack may also refer to:
Part of some sorts of equipment (e.g. breathing sets, flamethrowers) which is carried on the back "Backpack", a song by Crazy Town from the album The Brimstone Sluggers "Backpack", a song by Justin Bieber from the album Journals Plymouth Backpack, a concept car Backpack, a character in Dora the Explorer Badge Backpack, a repository for collecting and displaying digital badges from a variety of sources