First of all, you can put a couple of ice blocks in a pocket located centre of carafe. Then pour sake into a carafe from the mouth at the top. In fact, Ice is not touching sake directly so sake can be kept chilled without being diluted. If you want to enjoy your cold sake without sake becoming room temperature or being diluted, this is the perfect solution. Great gift idea with a bottle of sake. Comes in a shiny coated gift box.