Sterilite 03324706 5.7 Cups Square Ultra-SealTM Container, Pack of 6 A vent in the lid releases steam when the container is placed in the microwave, and all containers store efficiently both when In use and when not in use Color coded features in both the lid and base aids in easily identifying the proper lid and base combination Great for storing extra food for lunch Safe for freezer, microwave and dishwasher use 6 5/8L x 6 5/8W x 3 3/8H