knapsacks
n.
（士兵或旅行者的）背包( knapsack的名词复数 );
例句:
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And she thought of tripods and knapsacks.
围着的膝盖,而她却想到了三脚架和背包.
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After a short rest, they took up their knapsacks and went on.
休息了一会儿之后, 他们又背起背包上路了.
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Two knapsacks were beside her.
有两只背包在他旁边放着.
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The knapsacks on their backs,...were heavy and uncomfortable.
来自A. Ransome
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Knapsacks are filled with dollar bills that they distribute to the farmers who feed them.
来自NEWYORKER