Waterproof Oxford cloth, scratch-resistant, waterproof and can be easily cleaned, in the rain, the clothes, books or other can keep them dry. After swimming, you can also put the wet swimsuit inside it. With inner pocket - with zip, you can protect important things, 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, it wont hurt your shoulder. High quality lining fabric - 100% polyester, thickened, can carry more weight, long lasting, no need to worry that the bag will break after a few days. Multifunction - The drawstring rucksack is suitable for many occasions, such as hiking in the forest, for fitness, swimming or at school, you can put it in the sports bag and leave your hands free.