This is a revolutionary travel backpack that dramatically changes the way you travel and save money. With its large capacity and multi-pocket design, it can replace a 20-inch suitcase, and it doesn't require additional luggage fees to be paid to the airline. Comes with electronic air compressor pump, type-C charging cable without adapter, 2 air pump accessories. 17.72"x11.81"x5.91" meets most airline requirements for personal items. With a wet/dry compartment, this checked bag will meet your travel needs. This backpack will fit the vast majority of people, including college students. The super amazing main compartment can fit 50% more clothes in the same size backpack. Rechargeable air pump is easy to carry and ready to meet your air compression needs. 3 Steps for vacuuming, first place the clothes neatly into the vacuum compression bag, second close the zipper completely, third air pump to the air holes and double click the power button on the top of the air pump. We use nylon material for the outer layer of our travel backpacks to provide some water resistance, but long-term exposure to heavy rain is not recommended. Vacuum compression bags are smooth and waterproof on the inside and are easy to clean, but the backpacks should not be machine-washed or they will be damaged.