I debated what size to purchase but I ordered the 12 oz size. It isn't large enough to hold the largest Kuerig setting of coffee. However it will hold the medium setting with sweetener & cream.This cup is exceptional and has become my hands-down favorite! It is breathtakingly beautiful and of a perfect size and I plan to acquire another as well as a matching teapot. They are solidly made and of a good weight and the colors are bright and beautiful. The mug is lovely online but to actually experience it "in person" demonstrates that a photo cannot do it justice. This mug is well worth the cost and would make a lovely gift for yourself or, if you could part with it after seeing and holding it, a friend or loved one. The mug was shipped directly from Blue Rose Pottery and was packaged with great care. It arrived a bit sooner than expected and the folks at Blue Rose Pottery are lovely to work with.Though the design and quality of the Cups/mugs are good, capacity is not 12 oz. (approximately 10 oz.) ... disappointed...The handles were not smooth - had rough edges around it. This was most likely a second; probably will not be buying Polish Pottery from this seller again.