The set features four different container sizes with matching lids, so it is easy to find just the right container to store a given amount of food. Nonporous glass will not stain or absorb odors as plastic containers often do. These versatile containers can be used for baking, cooking, serving and storage. The individual items in this food storage container set are oven, microwave, refrigerator and freezer safe. They nest and stack for easy storage.