hav·er·sack
noun/ˈhævəsæk/
/ˈhævərsæk/
(old-fashioned)- a bag that is carried on the back or over the shoulder, used especially by soldiers or when walking in the country
（尤指野外步行背的）背包，褡裢 Word Originmid 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’.