【Efficient Vacuum Compression】Our vacuum compression backpacks feature a one-way valve chamber, you can choose our electric vacuum pump for rapid compression or manually press to release air, reducing wasted space between luggage expansion vacuum bags. Maximizes luggage space utilization. 【Large Capacity & Multi-layer Storage Space】Our main vacuum bag compress items to one-fifth their size, easy to carry more items, and can hold about 18-20 pieces of spring and fall clothes. A separate computer compartment can hold a 17-inch laptop. The vacuum-compressed capacity expands to 60 liters, equivalent to a 24-inch trolley case. 【Careful Detail Design】The shoulder straps of the backpack are designed with a three-dimensional sponge, which can not only reduce the pressure on your back but also make your back breathable and cool. The shoulder straps are also designed with fixing straps, which can make the airbag backpack fit your body. The trolley fixing straps allow the backpack to be fixed on the trolley case. 【Dry and Wet Separation】the interior also adopts a multifunctional layered storage design, with dry and wet separation areas, so you no longer have to worry about having nowhere to store dirty clothes and wet items. There are also compartment storage bags to fully meet your storage needs. 【Waterproof & Anti-theft】Made from durable polyester, our vacuum backpack protects your belongings on rainy days. It features a TSA Customs lock on the main compartment and a hidden back zipper pocket to protect your valuables.