This is a vacuum storage container that I received as a gift and have kept at home for many years. I am selling it because I have no plans to use it. According to the instruction manual, removing over 85% of the air inside the container prevents food from oxidizing, preserving its aroma and flavor, and also helps to prevent moisture. I have stored it unused, so I have not checked the vacuum state. I will offer it to those who understand the current condition. Price reduced.