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

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How to use zippers and vacuum extract air

To extract vacuum, you need to remove the small red lid inside

If 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 pump

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.