A high-quality reusable bag is often made from tightly woven nylon, polyester, rubber or waterproofed (plastic-coated) cotton.[2][3] Medium quality bags are similar, except they are not so tightly woven and may let some contents seep through the weave or the seams. After use, a reusable bag is washed by hand and hung open to dry. A high-quality bag may last for many years.