I love Ozeri products so I jumped at the opportunity to review the Instavac Food Storage containers. They come on a box of four different sizes with lids. How it works is you place the item you want to store and lock the handles of the lid into place next you can use your two thumbs side by side or the forefinger to simply press down on the center of the lid this forces any air out through the one way valve as you are doing this the green vacuum indicator in the center valve will pop down and whistle to create the vacuum seal next you will set the date dial which lets you k now the date it was stored. Next you can release the vacuum by pulling up one way valve lever and listen for the whistling sound. Last step release the handle and remove the lid. These containers are also BPA Free.The wave pattern on the bottom helps keep fruits and vegetables elevated from moisture and juices.
My Opinion: They work really well at keep the lettuce fresh for over l week.
You can also use these in the microwave to be splatter free, stain resistant and shatter proof. To learn more visit http://www.ozeri.com/#gallery
Where to Buy? You can buy these on Amazon.com at http://www.amazon.com/Ozeri-
Disclaimer: I was in no way compensated for this review and this is solely my own opinion which may differ from yours.