A sturdy bag or sack worn over the shoulder for carrying food and supplies, especially used by soldiers and hikers.
From Dutch 'haverzak' (literally 'oat sack'), from 'haver' (oats) and 'zak' (sack). Originally a soldier's ration bag, the term was borrowed into English during military campaigns.
The haversack was such a perfect solution to the soldier's supply problem that every army copied it—a single bag that hung securely while you marched, held just enough weight to sustain you, and kept your hands free for weapons.
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