(BG110) Reusable, made of heavy-duty coarse mesh polyester. Large enough to line the entire inside of our 6 gallon Screw-Top Poly-Fermenter. Just roll the top of the bag backwards over the brim of the container and pull the provided draw-string tight to keep it securely in place during primary fermentation. Very handy. When primary fermentation is done discard the pulp by releasing the draw-string and simply lifting the bag out. Also, useful as a grain sparging bag when making beer. Very tough. Dimensions are 18" wide by 24" tall.