Vacuum Backpack Travel Bag for Men Large Capacity Backpack Business Laptop Backpack Women Men Expandable Backpack School Bag

https://video.-media.com/seller/play/5000469690891.mp4How to use zippers and vacuum extract airTo extract vacuum, you need to remove the small red lid insideIf you need a vacuum pump, then you need to choose to purchase "with Pump"！！！ Only color without “with pump”, it does not come with a pumpVacuum bags require high airtightness, and special materials are used at the zipper, making it difficult to pull the zipper for the first time. You can pull it hard.