product informationColor: blackType: Backpack/BackpackFabric: Nylon/OxfordSize: 453015cmWeight: 1.10kgShoulder strap; length 70~100CM-The back pad adopts honeycomb design to promote free circulation of air, keep the back dry continuously, and effectively reduce back sweating when going out in high temperature- The outer fabric of the backpack is made of a new generation of Oxford woven water-repellent fabric; you can travel with peace of mind on rainy days, without worrying about rain soaking the contents of the bag;- Removable Item Compartment: Removable item compartment in the form of Velcro, easy to sort when there are many kinds of items-Exclusive water bottle position: equipped with exclusive water bottle bags on the left and right sides and equipped with water bottle fixing buckles to prevent them from falling out during exercise- Top invisible bag: easy to store some small objects; and good privacy, not easy to be stolen- Back trolley belt: an artifact that combines the backpack and the trolley case into one, greatly reducing the travel burden in daily use