Tupperware Ultra 21 3 Pc Cookware Set, 3 Qt Casserole Tupperware Ultra 21 3 Pc Cookware Set, 3 Qt Casserole Ultra 21 Cookware, goes into the microwave, conventional oven, fridge, even freezer (plastic seal does not go into oven or microwave) 3 Quart Casserole with 3/4 Quart Cover (can be used as a separate baking dish), and Seal Includes use and care instructions with recipes Dishwasher safe