... Color: Transparent Matreial : Normal Flint Glass OEM is offered 3 Gallon CarboyAdvantage: Good at Customization, professional comments, smooth communication, standard operating ... chemicals. The term carboy itself usually refers to a 5 gallon (19 L) carboy, unless otherwise noted. A 1.25 ... .5 L) carboy is usually called a jug. A 15 gallon (57 L) carboy is usually called a demijohn (in the ...