Masu (枡) is is a square Sake box. The typical one is made of wood, generally cedar or Hinoki. It is now used on celebratory occasions such as weddings, New Year’s Day.
It contains 180ml or 1 / 10 of a 1800ml Sake bottle. There is a unit special for Sake, Gou (合) and Shou (升). 1 Gou is equivalent to one cup of it(i.e. 180ml). 10 Gou (i.e. 1800ml) is equivalent to 1 Shou. Therefore:
