Description The backpack is made of high-quality polyester material and weighs 520 grams. With waterproof design, you don't need to worry about weather changes. The backpack capacity is 20-35 liters. The main compartment can easily accommodate clothing, books, iPad, kettle, etc. A front pocket and two side pockets are convenient for you to put your wallet, keys, earphones, tissues, etc. It is big enough to hold everything. Your shopping, travel, school and other essential things. Main Features • Soft and comfortable polyester • Water-resistant design • Stylish look Research & Development We have several options for developing new designs: 1) Customers provide their artworks and samples for making samples 2) Customers give us only their ideas, and we design and develop them. 3) We design and develop our new products according to our marketing experience for our customers' choice 4) Every season we develop new fabric and new colors for our customers. Sending us your product ideas today to contact us for more information on our abilities. Quality & QC procedure After the order is confirmed, we have a meeting with all the departments before production, investigate all the workmanship and technical details, make sure all the details are under control. 1)100% inspection for the cutting, main trim, production(making a pre-production sample before production)and the finished product. 2)Morning meetings by the factory director each day; 3)Q/A for the during and finished production; 4)Q/A for packing inspection; 5)Final inspection while packing up all the messenger bags. If there is no other problem at this stage, our QC will issue the inspection report and release for shipping 6) We strictly follow ISO AQL standards