"Gunny sck" hsa many aliases across the country. In Georgia and Mississippi it's called a "toe sac". In Mobile it would be called a "croaker sack" and in Apalachicola it's called an oyster sack/bag). AsW.C. McCall truckin' CB hit a'She was buit like a burlap bag full of bobcats.
When I was a kid rowing up in Iowa they were called "potato sacks". During WWII we could get a 100 lb bag of potatoes that they had culled sorting for good "chipping" (potato chips) and the two brands of chips they made were "Kitty Clover" and "HIland" chips. Back then a 100 lb bag of culled potatoes went for one dollar each...what they didn't sell they had to destroy.
Down on our farm, where I grew up, we raise cotton. We called that a towsack, because you ‘towed’ it behind you when picking cotton.