This backpack is made of durable waterproof polyester, good air permeability and heat dissipation with two padded shoulder straps, offers lightweight carrying and strength reinforcement, relieve shoulder pressure, and maintain cool when wearing for a long time. And it's hard, solid, and doesn't fade. USB Charging Port With built-in charging port allows you to charge your phone anytime, anywhere Anti-theft Multifunctional Backpack There is a zippered pocket on the back of the bag, which can hold valuables such as mobile phones and iPads, which is anti-theft and convenient. Multifunctional Backpack: Hybrid (Backpack, Duffel Bag, Shoulder Bag, Travel Bag). Can be served as everyday backpack, professional backpack for laptop or daily use anywhere for weekend, casual getaway