The bags are reusable, although not indefinitely, you throw away (or recycle) the cut off end of the bag, turn the bag inside out and put it in the dishwasher.
I have a food saver that I use to reseal chips, baking mix, marshmallows and all sorts of other things that come in plastic bags. When bone-in chicken breast is on sale, I’ll buy 10 lbs or so, make stock out of the bones, vac and freeze a bag of tenders, and vac and freeze family sized servings of breast.
