Vacuum Compression: One-way outlet valve design, not easy to expand after compression. You can press manually or combine with the pump to quickly compress the compartment volume and improve luggage space utilization. Extremely suitable for packing fluffy clothes (down jackets, parkas, coats, sweaters). In order to ensure the compression effect, the airtight zipper is used, which is more difficult to open and requires force Expandable Carry-On Backpack: Provides extra space when needed, and when fully expanded, it has the capacity of a 24" suitcase. Provides plenty of room for all your essentials and meets airline regulations for personal items add to its practicality Organizer Master: The vacuum travel backpack is carefully laid out with compartments and pockets to effectively organize your belongings. The main compartment has a wet pocket for separate wet items, a separate compartment for up to a 17-inch laptop, and a back privacy pocket to keep your valuables identified while traveling. The spacious main compartment easily holds 10-20 items of clothing, making it perfect for both short and long trips Comfortable and Ergonomic:The vacuum backpack is padded with honeycomb sponge back pad, ergonomic, breathable and heat dissipation; combined with wide flexible elastic shoulder straps to make the whole back of the shoulders evenly stressed, long time to keep comfortable. Trolley straps to secure the backpack to the trolley case Quality Assurance: The backpack is made of abrasion-resistant, water-resistant fabric, which boasts superb durability and practicality for all kinds of weather. This is useful for those who like to pack light but need more storage space for long trips, making it the first choice for travelers who need to optimize their luggage space Backpack Dimension: 18" x 12.6" x 8", Weight: 3.15 lb Dinictis Vacuum Seal Backpack 60L with Pump, Expandable Backpack with Vacuum Compression fits 17 inch Laptop, Water Resistant Carry On Suitcase Luggage suit for Short Trip and Business