SEA CHOICE Backpack 2-in-1 Vacuum Bag Trolley Backpack Waterproof Anti-Theft USB Charging Multifunction-Expansion

Gender: UnisexFeatures: USB charging port, 2-in-1 trolley backpack, anti-theft, waterproof, large capacity, expandable, TSA lockFeatures: Anti-theft, waterproof, large capacity, expandable, vacuum compression backpackKeywords: Travel Bag, Backpack, Bag Laptop Backpack, Business Travel Backpack, USB Auto Vacuum Compression BackpackThis backpack supports two ways to remove air from the vacuum bag:1. USB Auto Mode – Connect to a power bank or USB adapter, press the button, and the backpack will automatically suck out the air. Convenient and energy-saving!2. Vacuum Pump Mode – Use the vacuum pump to suck out the air when there's no power source.With these two methods, you can adjust the usage to suit the situation—whether at home, at the airport, or on the go!