In short and simple terms, the phrase "huge sack" refers to a very large bag or container.
Sentences with «huge sack»
The seats at the back were pulled up and folded away to make space for huge sacks of corn and rice, brown cardboard boxes and heavy bags. (theexpeditioner.com)
As I watched Antonio and his mother weigh huge sacks of chiltepíns on the small scale in front of the market, I asked Antonio about prices. (fieryfoodscentral.com)
He's never put up huge sack numbers at Ohio State (just four in his career), but he has coachable traits. (sbnation.com)