It leaks air; it wasn't in a vacuum state when I opened it.
- Please check if the rubber ring inside the lid is damaged and make sure the lid is properly closed;
- After closing the lid, press the middle button about 30-40 times to ensure that the air has been exhausted as much as possible. Do not touch the air release button on the side;
- Record the time required for the middle exhaust button to return to its original height. If the observation is obvious, can you shoot a video for us to show the problem?