Vacuum system: We're including an electric vacuum pump with every purchase (Charge cable included) . Press the switch on the electric pump twice, and it will spring into action immediately, rapidly removing air from the bag. Its powerful suction ensures a tight vacuum seal is achieved in no time which drastically reduces the volume of your stored items.Once you're finished, a single press of the switch turns the electric pump off. Independent Shoe Compartment: The vacuum backpack has a special compartment at the bottom for shoes which keep your dirty shoes separate from the rest of your gear. This compartment is designed to prevent odors from spreading and keeps your backpack organized.The shoe bag can hold a pair of slippers, casual shoes or sneakers. Dry-wet separation layer: The dry-wet separation layer is made of high-quality waterproof fabric. High levels of hygiene can be maintained through dry-wet separation. During the trip, just throw used towels, toiletries, etc. into the wet area. This not only keeps the bag clean but also prevents the spread of unpleasant odors. Comfortable and Stable:Both the shoulder straps and the back panel of the backpack are crafted from soft, high - quality sponge which are ergonomically designed. This evenly distributes the weight of the backpack, reduces the strain on your shoulders and back, and makes you more comfortable when walking, running,or climbing stairs with your backpack.Besides,We have added chest buckle in front of the backpack to ensure it stays snugly in place as you move. Large capacity Pockets: The size of this backpack is 47*33*20CM.The other small pockets of the backpack are very suitable for storing water bottles, umbrellas or other small items that need to be accessed quickly.There is also a hidden anti-theft zipper pocket on the back of the backpack to prevent your valuables from being stolen.Additionally, it meets the carry-on size requirements for airlines, helping you save on airline check-in fees. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.