Pyrex® Cook & Store Plus: cook, store, take away and heat... with only one dish! Thanks to the steam valve on the lid of the products, this range is ideal for microwave cooking and reheating. What's more, Cook & Store Plus are completely air and liquid tight, enabling easy transport - ideal for picnics or to packed lunches. Key Features: Completely air tight with steam valve High Thermal Shock Resistance Stain resistant and does not retain flavours Ovenproof, Freezer, Microwave and Dishwasher safe 10 Year Guarantee against manufacturer defect Easy Cleaning Please note: the lid is not ovenproof