FridgeSmart containers

I have owned these Tupperware FridgeSmart containers for a few years now. To be honest, I'm not even sure they really work. It's hard to know how much the quality of the refrigerator itself contributes to food going bad (from excess moisture for example). 

Anyway, the design is supposed to regulate airflow with the little white tabs on the side. Also, the bottom has ridges to allow for airflow along the bottom. On the side it gives you a little guide to what type of produce requires which settings.

So I'm not sure it they are really helping, but I feel like it does work out better than keeping things in a plastic bag where they tend to get slimy.