Carboys are glass jugs, much like plastic water cooler bottles, that brewers use for making beer, wine, hard cider and mead. Our premium Italian glass carboys are made of consistent, thick, high quality glass, ranging in capacity from 3 gallons to 6 gallons. Glass carboys are impermeable to oxygen, meaning it does not allow oxygen to pass through and affect the liquid inside. Glass carboys easy to clean, and will not scratch easily like a plastic carboy or bucket. When well taken care of they can last a lifetime.