back pack

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a bag carried by a strap on your back or shoulder
• Syn:
backpack, knapsack, packsack, rucksack, haversack
• Derivationally related forms:
backpacker (for: backpack), backpack (for: backpack)
• Hypernyms:
bag
• Hyponyms:
kitbag, kit bag