Waterproof - Oxford cloth, scratch-resistant, waterproof and can be easily cleaned, in the rain, the clothes, books or others can dry. After swimming, you can also put the wet swimsuit in it. With inner pocket - with zip, the important thing can be well protected, you could put the key, card or mobile phone in it, so you don't have to search for your key forever. Adjustable shoulder strap - Round thick rope, you can adjust the length of the strap by knotting, if there are many things in the bag, does not hurt the shoulder. High-quality lining fabric - 100% polyester, thickened, can carry more weight, durable, no longer worry that the bag will break for a few days. Multifunctional: the drawstring backpack is suitable for many occasions, such as hiking in the forest, for fitness, swimming or school, you can put the thing in the sports bag and leave your hands free.