Often preffered to plastic buckets/carboys due to their resistance to scratching and that they do not break down over time. Glass carboys can last for a very long time if handled properly. (The entire love2brew staff still has their first!) Use a #6.5 Drilled Rubber Stopper (CB009) or a Carboy Bung (CB030) for sealing. Note: This product is not eligible for free shipping.