Travel Casual 16 Inch Vacuum Compression Laptop USB Charging School Backpack Extended Hiking Business Backpack

The vacuum bag zipper is very easy to open and requires two hands to assist in opening. There is also an instruction manual inside, which is not a quality issue, but designed to prevent air leakage. Please be aware, thank you Product Name: Vacuum Compression Backpack Material: Waterproof Oxford cloth Size: 42*30*15CM After expansion: 42*30*20CM Capacity: can hold a 16-inch laptop Separate laptop bag Using the vacuum compression method: 1. Open the compressed vacuum lined bag 2, put the clothes on the air-tight zipper 3. Open the one-way exhaust valve 4. Press to exhaust the air inside Function: Breathable back Comfortable foam shoulder straps strap Anti-theft zipper pocket on the back Waterproof/wear-resistant/moistureproof Wet and dry separation area vacuum compression airtight password boarding Large capacity = 40L