This expandable vacuum backpack adjusts from 30L to 60L, offering a versatile 3-in-1 design those functions as a luggage bag, shoulder bag, and laptop bag. It includes a vacuum bag with a one-way valve for efficient packing—use an electric vacuum pump (Optional) for quick compression or press manually to remove air, saving space in your luggage. This vacuum backpack perfect for travel, work, or outdoor activities, it features a separate shoe compartment, multiple pockets for organization, and an anti-theft pocket for security, USB A charging port and luggage sleeve. The backpack bag made from waterproof Oxford fabric with rust-free metal zippers and a breathable, anti-sweat back panel, this backpack is both comfortable and durable for any adventure!