Selecting the right enamel mug involves considering both its size and how much it holds. A typical enamel mug is around between 3 and 4 inches in diameter, with a depth that can vary from ranging between 4 and 6 inches. When it comes to capacity, most enamel mugs hold approximately 10 to 16 ounces of liquid. To ideally choose an enamel mug, consid