Selecting an ideal enamel mug involves considering both its size and how much it holds. A common enamel mug is roughly in the range of 3 to 4 inches in diameter, with a depth that can vary from 4 to 6 inches. When it comes to capacity, most enamel mugs hold roughly 10-16 ounces of liquid. To ideally choose an enamel mug, imagine how you'll be usin