Material: Waterproof bright silk Oxford cloth & polyester Size: 42*33*1cm/16.53*12.99*0.39inch (Approx.) Bag shapes: square vertical section Opening method: pumping Bag fashion style: Drawstring bag Popular elements: contrast Inner structure of the bag: zipper pocket Strap quantity: double shoulder strap Style: Leisure / Travel / Fitness / Vacation 1. Waterproof - Oxford cloth, scratch resistant, waterproof and can be easily cleaned. After swimming you could also put the wet swimsuit in it. 2. With inner pocket - With zipper, it can protect the important thing well, you could put the key, card or cell phone in it, so you do not have to search forever your key. 3. Adjustable shoulder strap - Round thick rope, you can adjust the length of the strap by knotting. 4. High quality lining fabric - 100% polyester, thickened, it can carry more weight, long-lasting, no longer worry that the bag will break only a few days. 5. Multifunction - The drawstring backpack fits many occasions, such as hiking in the woods, to fitness, swimming or school, you could put the thing in the sports bag and leave your hands free. 6. 1* sports backpack