EXPANDABLE & LARGE CAPACITY: This extra large travel backpack with expandable feature offers you more packing capacity. 40L storage can easily hold packing cubes, make-up bag, outfits, camera and gear, etc. It fits overhead and under seat while on state of standard carry on size, is ideal for men, women, traveler, or occasional vacationer | LIFETIME COVERAGE: We will provide our worry-free life-time coverage service, and friendly 24-hour service support. Take responsible for any quality-related issues of the LCKPENG large travel backpack. THIS ITEM IS NOT INTENDED FOR USE BY CHILDREN 12 AND UNDER | USB CHARGING PORT: USB interface with built-in cable design, great convenience for charging your electronic devices via connecting your own power bank Comfortable breathable back design gives you maximum back support | EASY TO CARRY: The luggage backpack is light to carry due to its adjustable shoulder straps, comfortable air-mesh ventilated back panel. Two padded grab handles are set on the top and the side of the travel backpack, making it easily to take the bag from an overhead bin | BUILT FOR TRAVEL: Front compartment is for little gear such as notebook, pen, phone, earphone. The large inside pocket has internal compression elastic straps. The padded straps include a sternum strap that can be adjusted upward or downward, set to go across your chest, relieving the weight from your shoulder