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

How to use zippers and vacuum extract air To extract vacuum, you need to remove the small red lid inside If you need to bring a pump, you need to choose the option with a pump that is relatively expensive. If you do not check the option with a pump, there will be no pump. The SKU pictures show both with and without a pump. If the customer chooses the cheaper option without a pump, it is not due to the shortage. Vacuum 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.