CorningWare 20-Ounce Meal Mug with Vented Lid (Blueberry) CorningWare 20-Ounce Meal Mug with Vented Lid is perfect for microwaving coffee, tea, soup, oatmeal, and much more. Vented lid allows steam to escape, keeping the microwave clean and preventing burns. Durable stoneware material resists chipping and cracking. High-gloss exterior is non-porous, easy to clean, and won't absorb flavors, odors, or stains. Mug is dishwasher, freezer, and microwave safe. BPA-free plastic lid is top rack dishwasher, refrigerator, and microwave safe. Stoneware mug comes with a 1-year limited warranty. Plastic lid comes with a 2-year limited warranty against manufacturer defect.