Made from tempered glass, our Glasslock™ Food Storage Containers are manufactured to withstand repetitive use in the refrigerator, freezer and microwave.  You can store, heat and serve food all in the same, attractive container!  There&#x27;s no worry about warping, staining or absorbing food odors.  The unique snap-lock lid system features a durable silicone seal and is easy to open and close. For compact storage, the graduated sizes can be nested with their lids on.