Standard Masu 1Go Masu

Standard Masu - 1 go masu masu-japan.com/...
This is the most common, standard sized masu cup. From old times, masu cups of this size are used for drinking sake on celebrations in Japan.
Since the masu cups were used for measurement as well, its name comes from the traditional
Japanese unit of go, which is equal to the volume of approximately 0.1804L = 180.4ml.
For comparison please note that a usual glass cup in Japan has a volume of about 200ml.