Fast- FAST- This backpack with AIR PUMP.system features bi-directional valve chambers for easy space savings. Use the included electric vacuum pump to quickly compress items (or simply press manually to release air) and also inflate items. Enjoy optimized storage space and minimize wasted luggage space. Waterproof Durable - Featuring a water-resistant nylon exterior and a fully waterproof interior vacuum-sealed compartment, the bag keeps its contents dry even in heavy rain. Pressure-reducing shoulder straps and a breathablepad ensure all-day comfort. USB Charging On-The-Go - USB charging port lets you power devices without opening the backpack - simply connect your powerto the internal cable (powernot included). The scratch-resistant port cover maintains weather resistance while providing instant access to charge phones tablets during travel, hiking, or daily commutes. Multi-Functional for Any Scenario -for travel, gym, or daily use! Features a maincompartment front accessory pocket dedicated shoe compartment to keep clothes andneatly organized. Airline Approved Backpack - Save on check-in fees by meeting major airline carry-on baggage size standards. Reduces the risk of lost luggage. Thecan be snapped on to the trolley handle to create an integrated mobility solution, allowing you to travel through airports with ease.