Mokkiri: This is a two-part method of serving sake, with the larger (about 180 ml) mokkiri cup sitting inside a wooden box, or "masu." This is a popular way of serving in Japanese bars, as it allows the host to demonstrate their generosity by overfilling the mokkiri and having the sake caught in the masu beneath. Any stray sake can be safely poured into the cup or drunk directly from the masu itself.
A Sake Masu is a traditional Japanese wooden box that is used to serve sake. It is typically made from cedar wood and has a square shape with inward sloping walls. The sake is poured into the masu, and the box is then used as a drinking vessel. Sake masu are often used during celebrations or special events, and they are also commonly used in Japanese restaurants to serve sake.