These water resistant drawstring gym backpacks are made of polyester material and are water resistant. There is one side pocket with zipper and it cinches tightly on the top of the drawstring backpack bag for your items safe. The drawstring backpack or cinch bag is an ideal storage bag for hiking, travel, beach, gym, sport, summer camp, shopping, and other outdoor activities and any occassions. You can use this drawstring backpack daily for your lunch thermos, water bottle, coffee mug and more.This water resistant drawstring bag brings you safe, comfortable and covenience.