There are variety of Tupperware Food containers specially designed to serve for food storage purposes.
"Food storage containers" is actually a very general term; but Tupperware had designed different range of Tupperware containers to serve different kind of food.
You need to understand what kind to containers is better to store which kind of food; in order to keep your food fresh and long lasting :)
There are 4 different shape of modular mates containers, you can understand each of them here:
Tupperware Onion Keeper is a fantastic product to keep your "breathing food" fresh.