Expandable design: Before the extension dimensions are 17.7x11.4x6.3 inch/45*29*16 cm, and after the extension dimensions are 17.7x11.4x9.4 inch/45*29*24 cm. You can expand the zipper and buckles according to your requirement.
The two handles are set on top and one side, which allows an easy switch between backpack and suitcase. So it can be carried vertically or horizontally. The luggage belt on the back allows be slid over the luggage tube, it's great for daily travel
Design: Waterproof PVC material to protect your goods from water. Ergonomic airflow back design with thick but soft multi-panel ventilated padding for added support and comfort, decreasing the pressure on the shoulder and neck.
Large capacity: The backpack with many compartments. The main pocket can hold your travel goods, and fit 5-8pcs of clothes. The front compartment can also hold magazines, Ipad, and books, and a power bank that can charge your phone.
USB Charging Port Design: The USB backpack comes with a charging port you can link your phone to and easily charge outdoors and travel. Place your power bank inside the bag and connect your phone to the outer port (built-in charging cable inside).