a single-strapped bag worn over one shoulder and used for carrying supplies.
a soldier's bag for rations, extra clothing, etc.

1740–50; earlier havresack < French havresac < German Habersack, equivalent to Haber oats (compare dialectal English haver < Old Norse hafrar oats) + Sack sack1

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World English Dictionary
haversack (ˈhævəˌsæk)
a canvas bag for provisions or equipment, carried on the back or shoulder
[C18: from French havresac, from German Habersack oat bag, from Old High German habaro oats + Sacksack1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1749, from Fr. havresac (1680), from Low Ger. hafersach "cavalry trooper's bag for horse provender," lit. "oat sack," from the Gmc. word for "oat" (cf. O.N. hafri, M.Du. havere, O.H.G. habaro). "Haver is a common word in the northern countries for oats." [Johnson]
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Hands-on reproduction objects in the soldier's haversack and lady's purse are
  also featured.
If you haven't already done so, have the students make a haversack.
They carried food and small items in a haversack made of linen with a three
  button flap.
To explain his duties, this soldier carries an artillery haversack of
  reproduction tools used to fire cannons.
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