Four-piece Starter Set includes two 1¾ qt/1.8 L Small Deep containers, one 1¾ qt/1.8 L Medium container, and one 1-gallon/4.4 L Medium Deep container. Perfect storage conditions for all your favorite vegetables! Top food scientists from the University of Florida and Tupperware have researched the storage of fruits and vegetables extensively to develop a line of intelligent containers.​ FridgeSmart® containers use Tupperware’s ACE™ (Atmosphere Controlled Environment) system: special three-way vent and custom base help regulate the atmosphere inside the container by balancing the flow of oxygen coming in and carbon dioxide going out. ​