【Vacuum Compression Backpack】This travel backpack features a built-in vacuum compression function, allowing you to expel air from inside via an air release valve to create significantly more storage space. You can choose to use the included manual vacuum pump for quick compression, or simply press down manually to expel the air; this effectively minimizes wasted space between vacuum bags, maximizing your overall luggage capacity. 【Vacuum Function & Built-in Air Pump】The backpack is equipped with a built-in air pump, eliminating the need to purchase a separate device. This versatile pump performs both inflation and deflation functions, adapting to a wide range of usage scenarios. 【Space-Saving Storage Design】Our vacuum travel backpack features a \"wet/dry separation\" design. In addition to its vacuum compression capability, it includes multiple multifunctional compartments, side pockets, and a dedicated padded laptop pocket, helping you keep your personal belongings neatly organized. The vacuum storage compartment boasts excellent airtightness, effectively isolating items with strong odors. Please note: The vacuum-sealed compartment uses a high-airtightness zipper and a very tight locking mechanism; consequently, you may need to apply slightly more force when opening it. 【Ryanair Carry-on Standards】This backpack meets Ryanair's maximum carry-on size requirements, easily fitting into overhead bins or under the seat in the aircraft cabin. The backpack opens completely flat – 180 degrees – just like a suitcase, with an organized internal layout that facilitates quick and efficient packing. It also complies with the carry-on regulations of most other airlines, including easyJet and Wizz Air, ensuring a hassle-free flight experience. 【Designed for Travel】The backpack's rear features a luggage strap that securely slides over the handle of your rolling suitcase, completely freeing your hands. A discreet zippered security pocket on the back panel offers a safe and hidden place to store your passport and other valuables. Constructed with a waterproof, breathable honeycomb mesh back panel and comfortable padded shoulder straps, the backpack effectively alleviates back pressure, helping you stay cool and energized throughout your journey. Whether for business trips, university travel, or short weekend getaways, this backpack is the perfect companion for your travels.