Instant Compression - This Vacuum backpack Dual Valve Air Pump System compresses the gear in seconds (or releases the air manually) with the included electric pump. It also inflates items - perfect for travelers who maximize luggage space. Weatherproof Design - The backpack has a rain-packing, waterproof exterior while its vacuum-sealed waterproof core keeps contents completely dry. Everyday practicality meets extreme weather performance, making it ideal for urban commuting and outdoor adventures. USB Charging Convenience - Connect your power bank (not included) to the internal cable and charge devices on the go - no need to open the bag. The anti-scratch, weatherproof cover protects the port from the elements and provides durability.