This custom cotton drawstring bag/backpack is made of 100% natural cotton fabric. With cinch closure on the top, it protect your essential belongings from falling out. This canvas string bag can also be used as backpack when you are carrying heavy things. With cotton cords on the side, it is very strong. The drawstring bags also can be made of non-woven fabric, polyester or nylon material. We also can call them as non-woven string bag/backpack, polyester gym backpack, nylon drawstring bag, etc.