The name of this product series comes from “Jack” as an American man’s common name. We meant to give a friendly impression by adopting this name. The appearance represents the 1950’s American tableware. “Jack” mug features a bigger handle and a large capacity and also unisex design. The sides with a little curves will give a soft feeling in spite of the bigger form. The material and capacity are optimum for daily use, so we would really like you to use it casually almost everyday.