Ichigo is a liquid unit of measure equal to 180ml or about 6 fluid ounces. Often in Japan, sake is ordered in a restaurant by the “go”. The go is also the amount that will fit inside a standard masu box or single serving tokkuri sake carafe. For example “one go” would be called ichigo (ichi = 1), and a “four go” bottle is called a yongobin (yon = 4 and bin = bottle) – that would be 720ml. People sometimes wonder why wine bottles in the west have a standard size of 750ml, while sake has a standard bottle size of 720ml…well, it is because of the ichigo measurement.