Description:Anti-theft code lock, water-repellent fabric, external USB charging, three-dimensional EVA high-strength compression material, back anti-theft zipper pocket, EVA anti-shock board.Make the backpack strong against impact, better protect the items in the backpack, large capacity.The backpack has two independent clamshell compartments and additional protective pads, suitable for 15.6-inch clamshell and 12-inch ipad.There are many internal compartments, which are convenient to carry the necessities of life, and can accommodate travel clothes for a few days.The trolley case fixing strap allows the backpack to be combined with the trolley case, freeing your hands and making your travel more relaxed and happy.Specification:Material: Oxford spinningWhether with lock: YesWith or without rain cover: YesFunction: breathable, waterproof, wear-resistant, anti-theft, anti-vibration, lighteningHardness: medium to softLining texture: polyesterStrap root number: double rootCarrying parts: soft handleCarrying system: air cushion strapSize: 17.71x12.59inch/45cmx32cm, thickness 4.72inch/12cmPackage Includes:1x backpack