[1] : The Collaborative International Dictionary of English v.0.48

gunny \gun"ny\ gu^n"ny^, n., gunny cloth \gun"ny
cloth`\klo^th`; 115. hind. go.n, go.nimac, a sack,
   sacking.
   a strong, coarse kind of sacking, made from the fibers
   called jute of two plants of the genus corchorus c.
   olitorius and c. capsularis, of india. the fiber is also
   used in the manufacture of cordage.
   1913 webster

   gunny bag or gunny sack, a sack made of gunny or burlap,
      used for coarse commodities. in the southern u. s. similar
      sacks are called crocus sack, croker sack, towsack,
      and grass sack.
      1913 webster +pjc
see also:
corchorus c. olitorius c. capsularis gunny bag gunny sack crocus sack 
croker sack towsack grass sack 

[2] : WordNet (r) 2.0

gunny sack
     n : a bag made of burlap syn: gunnysack, burlap bag
see also:
gunnysack burlap bag 

Gunny Sack >> G Words
Gunny Sack, definition of term: Gunny Sack
gunny+sack_pag1.html

Gunny >> G Words
Gunny, definition of term: Gunny
gunny_pag1.html

Sack >> S Words
Sack, definition of term: Sack
sack_pag1.html

Sack Up >> S Words
Sack Up, definition of term: Sack Up
sack+up_pag1.html

Sack Out >> S Words
Sack Out, definition of term: Sack Out
sack+out_pag1.html