1. Efficient vacuum compression: Our vacuum compression backpacks feature a oneway valve chamber. You can use our electric vacuum pump for quick compression or manually press to deflate, minimizing wasted space between vacuum bags and expanding luggage capacity. This maximizes the utilization of your luggage compartment. 2. Large capacity and multilayer storage: Our main vacuum bag compresses items to onefifth of their original size, allowing you to easily carry more. It can hold approximately 1820 spring or autumn garments. A dedicated laptop compartment fits a 17' laptop. The vacuumcompressed capacity can expand up to 60 liters, equivalent to a 24inch trolley. 3. Thoughtful detail design: The backpack's shoulder straps are equipped with 3D sponge padding, reducing back pressure while keeping you cool and breathable. Adjustable fastening straps ensure a proper fit. The trolley attachment straps allow the backpack to be securely attached to a trolley for easy transport. 4. Drywet separation: The interior features a versatile, multilayer storage design with dedicated dry and wet compartments, eliminating worries about storing dirty clothes or damp items. Additional storage pockets with compartments fully meet your organizational needs.