PET carboy vs Glass carboy in pharma: Understanding Your Alternatives Kumar Jeetendra | February 24, 2023 A carboy, often known as a demijohn or a lady jeanne, is a rigid container with an average capacity of 1 to 16 US gallons (4 to 60 litres). Carboys are typically used to transport liquids, typically water or chemicals. One might assume that selecting a carboy is a straightforward process. There are both glass …