Origin: Fr havresac < Ger habersack, lit., sack of oats < haber (now hafer < LowG), akin to E dial. haver, oats (? orig. “goat food” < IE base *kapro- > L caper, goat) + Ger sack, sack
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Origin: French havresac, from obsolete German Habersack : German dialectal Haber, oats (from Middle High German habere, from Old High German habaro) + German Sack, bag (from Middle High German sac, from Old High German, from Latin saccus; see sack1).