Multi-functional vacuum shoulder bagMaterial: Oxford cloth, polyester fiberSize: 19.3 * 7.8 * 12 inches/49*30*18cmCapacity: Normal 25L\Expansion 30L\Vacuum compression + expansion 60LGender: For both men and womenFeatures:1.Equipped with a one-way valve that can be manually pressed to release atmosphere. This innovative feature allows you to fully utilize the capacity of your backpack. With vacuum compression, the capacity of the backpack can be expanded to 60 liters, equivalent to a 24-inch rolling suitcase.2. It has multiple compartments and wet/dry pockets that allow you to keep wet towels and clothes separate from other clothing and electronics.Use Steps:Fast exhaust, one-way atmosphere valve chamber designed according to pneumatic principle, easy to press and exhaust without atmosphere pump, quickly complete the compression process.1. Open the compression vacuum liner bag2. Gather clothes and zipper up the sealing zipper3. Open the one-way atmosphere valve4. Press to exhaust internal atmosphereProduct ListMulti-functional vacuum shoulder bag*1