packsack

名词 packsack:

1. a bag carried by a strap on your back or shoulder
   同义词：backpack, back pack, knapsack, rucksack, haversack

pack.sack

n.（名词）
A canvas or leather traveling bag designed to be carried while strapped to the shoulders.
背包：用带子系在肩上可用来装东西的帆布或皮制的旅行包