What is the volume equivalent of the unit 'Itto' in sake measurement?

The unit 'Itto' in sake measurement refers to a volume equivalent of 1.8 liters, which is commonly rounded to 18 liters in discussions of sake bulk storage and sales. This measurement is significant in the context of sake production and packaging as it reflects the traditional metric used for bottling and serving sake in larger formats, specifically in the context of a wooden masu or other vessels, where it is also a standard quantity used in the industry. Understanding this unit is crucial for professionals dealing in sake to properly gauge volume for production, distribution, and consumption.