/ ˈhævəsæk; NAmE -vərs-/ noun
( old-fashioned , BrE ) a bag that is carried on the back or over the shoulder, especially when walking in the country
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WORD ORIGIN
mid 18th cent.: from French havresac , from obsolete German Habersack , denoting a bag used by soldiers to carry oats as horse feed, from dialect Haber oats + Sack sack, bag.