(BG120) Reusable, made of heavy-duty coarse mesh polyester. It has a draw-string closure. Allows you to keep the pulp contained while in the primary fermenter. Makes it easy to remove the pulp when its usefulness in finished. Also, useful as a grain sparging bag when making beer. Very tough. Perfect size for collecting pulp for a 4 to 8 gallon batch. Dimensions are 15" wide by 18" tall.