Carboy
（重定向自Carboil）
![A 6.5-gallon (24.7 l) glass carboy acting as a fermentation vessel for beer. It is fitted with a fermentation lock.](/Images/godic/202501/03/CarboyHomebrew3341.jpg")
![A Bulgarian demijohn (damadzhana)](/Images/godic/202501/03/Domijohn3341.jpg")
![Glasballon mit Auslauf im Holzverschlag](/Images/godic/202501/03/Glasballon_mit_Auslauf3341.jpg")
![Gefüllter Glasballon](/Images/godic/202501/03/Glasballon3342.JPG")
A carboy or demijohn is a rigid container with a typical capacity of 20 to 60 L (5 to 15 gallons). Carboys are primarily used for transporting liquids, often water or chemicals.
They are also used for in-home fermentation of beverages, often beer or wine.