????Introduction?Hello! This is 100% pure nylon material, capacity?36-55 liters?Multiple pockets. ????Large & Multipurpose Pockets?External dimensions: 21"H x 14"L x 6.3"W?in?; Capacity: 36-50L, The main compartment has roomy interior, it is not only able to accommodate most popular 17inch laptop, but also can hold tech electronics and daily necessities easily, and three generous exterior front pockets can store essential accessories very well. ????Fashionable & Convenient Accessories?This stylish set-in external Micro-USB port and standard charging cable, in order to offer you a more creative way to charge your electronic device and make a more convenient use experience. Meanwhile, please note that this backpack doesn't include a power bank. ????Secure Support & Practical Design?This backpack comes with a password lock, it is guaranteed for protecting your valuable items inside. The side elastic net pockets are convenient for holding umbrellas or water bottles. All-match design suit for school, college, business, travel, camping, hiking and other daily use. ????Superior Quality & Premium Craftsmanship?Made of heavy duty water resistant Oxford fabric and durable metal zippers, protects your device from light rain and accidental spills (Long time soaking is NOT recommended). Sturdy edge lining adds additional protection around the edges. Ergonomics top handle for a long time carry.