English to English

noun (n)

• a bag carried by a strap on your back or shoulder(noun.artifact)

  Synonym:
  back pack, backpack, haversack, packsack, rucksack
  

  source: wordnet30
• A case of canvas or leather, for carrying on the back a soldier's necessaries, or the clothing, etc., of a traveler.(noun)

  source: webster1913