This product backpack is made of waterproof nylon material with 21od oxford lincloth, which is soft, easy to carry,with large capacity , firm, wear-resistant and durable,and high grade. Everyday objects can be included.Suitable for young men and wonmen of all ages , studenes and office workers. of fashion patterns as customers wish.The lightness and dexterity really show its value. This kind of waterproof material is the best quality and best-selling product in the backpack marke. Visit the factory for guidance.