With it, say goodbye to the suitcase Scientific storage, box-style open pocket design, can be carried on the shoulder or by hand. Spacious bag can be used to store many eentials and electronic devices. You can conveniently store your clothes, electronic devices, files, folders or sports kits in them. 3D three-dimensional breathable decompreion shoulder strap Thick and soft, more easy to carry, good heat diipation performance! The trolley case fixing strap can combine the backpack with the trolley case, freeing your hands and making travel more relaxed and enjoyable. The external USB interface design on the side of the backpack is convenient for charging the mobile phone at any time, freeing your hands and making travel easier.