Features 1. Vacuum compression: Equipped with a one-way valve, you can choose our electric vacuum pump for quick compression or manual pressing to release air, thereby reducing wasted space between luggage expansion vacuum bags. Maximize the use of luggage space. 2. Scalable capacity: It can be expanded to a capacity of up to 60 liters through vacuum compression, equivalent to a 24 inch rolling suitcase. However, its dimensions are 49 x 32 x 15 cm/19 x 13 x 6 inches. 3. Wet dry separation: With multiple compartments and wet dry separation bags, it can prevent wet towels, clothes from dirtying other clothes and electronic devices. 4. Anti theft design: The main compartment is equipped with an anti-theft password lock, and there is a hidden zipper pocket on the back to protect your valuable items from theft. 5. Multi functional application: Made of durable Oxford cloth, it provides additional protection for your items on rainy days and ensures long-term use for daily and weekend travel. Perfect for college backpacks, weekend travel backpacks, airplane carry on backpacks, and professional business backpacks, it is the perfect gift for travelers. Specification Material: Oxford Color: Black, Gray, Dark Grey, Blue Size: 49 x 32 x 15 cm Weight: 1800 g Package Include: 1x Expandable Vacuum Backpack