Denash 25L 30L 60L Vacuum Seal Travel Backpack, Lockable Carry-On Suitcase Luggage, Expandable Air Compression Vacuum System

Compression Assistant: With one essential vacuum and compression, this backpack provides a convenient and quick storage solution. (Note: This function acts as a compression assistant, and manual assistance may be required for the compression to tighten.) It also comes with a Type-C interface for use with an external power bank or plug. Vacuum Compression Main Bag: Expands 5cm to provide 1.2-1.5 times the capacity of a regular backpack, easily accommodating all your luggage without worrying about overflow. The zippered expansion layer design allows this backpack to double as a suitcase, eliminating the need for airport check-in lines. 180-Degree Opening: Features a one-piece box construction and a user-friendly design. The main bag opens and closes 180 degrees for easy storage and convenient retrieval of large items. User-friendly design: Includes side elastic zipper pockets for items such as umbrellas and water bottles, a thickened laptop bag for 17-inch laptops, a back security zipper pocket for valuables, and a security combination lock design to protect the contents of the laptop compartment. Back design: Utilizes thickened beehive back padding with high-evaporability cushion cotton to effectively reduce both shock and heat. Complies with human ergonomics to efficiently distribute back pressure for enhanced comfort and ventilation.