Material: Waterproof filmAccommodating computer size: 15.6Capacity: 56-75LShoulder bag size: length 30*width 12*height 42cmShort trip + commuting, simple travel, three-dimensional large-capacity streamlined package, simple and individual, independent computer layer, meeting the requirements of urban peopleSimple and lightweight backpack, small body and large capacity for life, large capacity storageScientific compartment with large capacity, effective and reasonable use of the internal space of the body, divided into multi-level patterns, sorting large and small items in an orderly manner, avoiding chaotic fashion travelWith an external charging port, the battery life of the mobile phone is guaranteed when going out. You only need to connect the mobile charger to the internal data cable of the backpack to achieve the charging function