【Flight Approved Travel Backpack 】The size of the backpack is 42*29*15 cm/16.54*11.42*5.9 inches (manual measurement may have error, the error is not more than 3 cm), this backpack meets the maximum size allowed by most airlines and is suitable for both daily travel and business travel. You can put it under your seat or on the overhead luggage rack. 【Compartments and multiple pockets】 The large capacity carry-on travel backpack has three compartments. The front compartment is a smaller compartment for your passport. The middle compartment can hold magazines. The back is the largest compartment of the backpack and expands 180 degrees to hold 1-3 days worth of clothing. In addition, the backpack has several small pockets for different purposes, so you can easily organize your belongings. 【Vacuum Compression Bag and Air Pump】 There is a vacuum compression bag inside the largest compartment of the backpack, you can put the clothes into the vacuum bag, tighten the zipper, open the one-way exhaust valve, and use the air pump for vacuum compression to reduce the volume of the items occupying the volume, and load more things. Please note that the zipper used in the vacuum bag requires more force to pull, this is to ensure that the vacuum airtight, not the zipper damage is not smooth. 【Water-resistant Fabric】Made of high-density splash-proof fabric, not easy to get wet by light rain. (Prolonged water immersion will still be wet.) 【Thickened Pressure Reducing Sponge and Luggage Strap】The handle, shoulder straps and back pad are made of thickened soft sponge and breathable mesh material, which is comfortable and breathable and reduces the pressure on your shoulders. The backpack is designed with luggage straps on the back, which can be slipped onto the trolley bar of most suitcases to reduce the burden. The winspansy vacuum tote backpack is made of high-density water-resistant fabric, which is not only waterproof and abrasion-resistant, but also scratch-resistant. You don't have to worry about your backpack getting wet even when it rains. The winspansy backpack with vacuum sealed compartments. You can compress and release the air by pressing manually or using an air pump. This large-capacity men's travel backpack helps compress clothing and is perfect for 3-5 day trips. It has multiple separate compartments for clothes, daily essentials, documents and other personal items. The main pocket has vacuum pockets to not only save space but also organise your various items, and the front compartment can hold a 15.6 inch laptop with more space. The vacuum pocket of the vacuum backpack has a high-density vacuum special zip, which is not easy to open, but this is to ensure the airtightness of the vacuum pocket. Meanwhile, the vacuum travelling woman backpack has many user-friendly designs, such as adjustable chest strap, breathable shoulder straps and luggage straps. About the air pump instructions： 1. Each light represents 20% of electricity, when the light is not on, it means that the air pump power is less than 5%, it should be charged in time. 2. Press the blue button twice to switch on and once to switch off. 3. Choose only one suitable nozzle at a time 4. Inflate: Install a suitable nozzle in the inflatable port and connect it to the product, then turn on the pump to start inflating. 5. Exhaust: Install a suitable nozzle at the exhaust port and connect it to the product, then turn on the pump to start exhausting. Warm tips:Do not store the air pump in a fully discharged state for a long time, charge it at least once a month during storage.