Specification: Item Type: Vacuum Compression Backpack Material: Velvet PU Leather, Oxford Fabric Function: Expandable Body Waterproofing: Yes Capacity: 25L-30L-60L Size: Approx. 30 x 49 x 15cm / 11.81 x 19.29 x 5.91in (Expanded Thickness: Approx. 20cm / 7.87in) Vacuum Power Interface: Type C (Power Cable Not Included) Built In Compression Assistant: One key touch vacuum start for easier packing. Type C interface, compatible with power banks or power adapters. One key switch for quick compression. Storage: Phone, Umbrella, Headphones, Wallet, Laptop, Clothes, etc. Type: Backpack Weight: Approx. 2150.00g / 75.84oz How to Use: Method 1: Using the Compression Aid 1. Open the vacuum compression bag. 2. Place clothes inside and seal the airtight zipper. 3. Connect the power; the red light will turn on. Press the button to start. 4. While the compression aid is running, manually press down to remove air. Method 2: Manual Compression 1. Open the vacuum compression bag. 2. Place clothes inside and seal the airtight zipper. 3. Open the one way air valve. 4. Press down to remove air, then close the valve. How to Set Password: 1. Adjust to correct password, default password 000. 2. Press reset button, use pen or tool to press code adjustment button. 3. Set independent password, rotate password wheel to set password e.g. 888. 4. After setting password, press button to confirm, code adjustment button will p​op out.​​ Package List: 1 x Vacuum Backpack Notice: 1. This product is called a compression aid, not one button compression. 2. The device will enter a slow phase after about 30 seconds of suction.