back·pack /ˈbækˌpæk/
(v.)挑運[貨物]
backpack
n : a bag carried by a strap on your back or shoulder [syn: back
pack, knapsack, packsack, rucksack, haversack]
v : hike with a backpack; "Every summer they are backpacking in
the Rockies" [syn: pack]