Dimensions: 29*12*41 cm/ 11.4*4.7*16.1 in Waterproof, Wear-resistant, Capacity-expansion, Load-reducing External USB socket design, connect the charging bank inside the bag, the mobile phone can be charged at any time. Scientific shoulder straps Thicker and wider ergonomic shoulder straps, balancing the force Protects the spine and reduces pressure on the shoulders. The air deflector back panel design allows air to flow freely, keeping your back dry at all times. Thickened Pearl Cotton on the back, decompression and anti-shock, no burden for traveling. The backpack is made of high standard YKK zippers, which are made of sturdy material and more durable. Features: -Individual computer compartment -Convenient storage -Water-resistant fabric -Comfortable shoulder straps -Multi-compartment design -Convenient card pocket design -Large capacity storage