I found this food container when I was looking for my oatmeal. It was almost full when I found it. Its almost empty now. I never know where it came from and I am too lazy to ask.
This container looks like ordinary but it has a special feature that cannot be found in other food bin. It can create a partial vacuum environment. Its only partial cause it will surely crumple in case of complete air absence.
The cover has four sealing arm to hold it firmly against container brim. There is a rubber lining underneath. Its purpose is obvious, to prevent air entry and maintain vacuum pressure.
The vacuum can be created by pushing the cover slowly downward. The air will exit via one-way valve (the orange color circle). The valve will not permit air entry. Pushing the cover down several times will create a good vacuum.
Vacuum pressure can be released by flipping the one-way valve up. A sudden and short whistling sound should be heard. By the way, pressure release is not so important. Just open the container and get the food items.
I think this will be good in preserving the crispiness of potato and banana chips! I gonna try it as soon as I consumed the oats.