haversack
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/ˈhævərsæk/
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/ˈhævəsæk/
A bag with one or two straps, used for carrying things on your back or over your shoulder. It's often used by soldiers or people going on a hike.
He packed his haversack with food and water for the long hike through the mountains.
他为穿越山区的长途徒步旅行,将食物和水装入他的背包。