Kombucha Fermentation Jar, One Gallon, with White Cotton Cloth Cover Perfect Jar for making Kombucha! Includes a 1 Gallon Glass Jar, a Cotton Cloth Cover, and a Rubber band. Cloth covers will help you avoid dust, fruit flies and mold - an essential to your brewing setup. Cloth is 8" x 8" cotton, bleached white, with pinked edges.