As of July 2015, quality brands of 20-ounce ceramic coffee mugs include Corningware's French White mug and Chantal's Ring Mug. Both earn over 4.5 stars from online five-star review systems.
Corningware's 20-ounce mug has a vented plastic cover for storage and reheating. Reviewers at Wal-Mart's website indicate that the mug is versatile because it is useful for coffee, other hot beverages, soups, noodle dishes and leftovers. It is easy to clean and durable.
Amazon.com reviews of the Chantal mug say that it is attractive and sturdy. The handle is large and comfortable. However, the mugs become very warm when heated in the microwave.