Funaguchi is an un-pasteurized and un-diluted type of Sake and as such it is surprisingly delicate. The most damaging elements to the quality of a Sake are the light, heat and the air. So in order to deliver the unique taste of freshly brewed Sake, KIKUSUI had to revise its brewing techniques. In order to protect this delicate Sake from the damaging light rays we decided to use aluminum can to completely block out the light. Then we filled the normally 180ml cans right to the top, to 200ml, to reduce the amount of air that could come into contact with the Sake. This way we could protect this delicate type of Sake allowing more people to enjoy the flavor of pure Sake previously only available to those lucky enough to visit the brewery.