I use double knits to make large stuff sack draw string bags. They are great for holding a sleeping bag, pillow and extra blanket for camp or to haul laundry home from college. My daughter was always dragging hers on the ground heavily loaded with laundry and they took all the abuse. I use my preserving kettle lid (18" diameter) to draw a circle for the base and a width of fabric (it's 60" wide) to make the sides, stitch the drawstring casing at the top and insert the cord. I've made them for all my kids, their cousins and friends and the local Girl Guides and Scouts. Everyone loves these sacks!