The package design for the “pure soy sauce series” employing a bottle that prevents oxidation of the soy sauce. The package design fulfills two separate purposes - it conveys the unseen until now functionality of the bottle as something to “prevent oxidation”, as well as conveying the “delicious taste of pure soy sauce” from a taste perspective. Once you use it, you get a sense of its worth; while slightly more expensive than other products, sales nevertheless continue to rise each year.