Large Capacity Expandable Airbag Backpack for Men 15.6 Inch Waterproof Laptop Business Bag Vacuum Storage Travel Black Backpacks

Quick Exhaust, The One-Way Air Valve Cabin Designed Based On The Principle Of Pneumatics Can Be Easily Pressed To Exhaust Without The Need For An Air Pump, Quickly Completing The Compression Process.
1. Open The Compressed Vacuum Lined Bag
2. Pack The Clothes And Zip Up The Airtight Zippers
3. Open The One-Way Exhaust Valve
4. Press To Expel The Air Inside