Key Product HighlightsPremium Borosilicate Glass: Durable, thermal-shock resistant construction that easily transitions from cold storage to heat.Multipurpose Utility: Typically safe for use in the microwave, oven (without the lid), freezer, and dishwasher.Leakproof Seal: Outfitted with 4-side snap locks and internal silicone gaskets to prevent accidental spills and keep food fresh longer.Stackable Design: Nesting shape saves valuable shelf and refrigerator space