Water repellent fabric: The three-dimensional honeycomb breathable fabric releases the hot and humid back and keeps it dry. The breathable and elastic shoulder straps reduce the pressure on the shoulders.<br />Perfect size, impeccable design:dimensions are 11.8" x 15.7"x 5.5"(30*40*14cm).<br />Function and safety: The trolley case fixing strap design can be used with the trolley case to release the pressure on the shoulder, and there is no burden on long-distance travel!<br />USB charging: The backpack has a built-in charging data cable and an external charging port; the mobile phone can continue to last. ">