名词<美>（士兵或徒步旅行者用的帆布或皮制的）背包
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1. 背包：packplane /货舱能脱换的飞机/ | packsack /背包/ | packsaddle /驮鞍/
packsack
noun
1. a bag carried by a strap on your back or shoulder
Synonym: backpack back pack knapsack rucksack haversack