Control your home fermentation with Cool Brewing's F-COOL Fermentation Cooler in black. The insulated and innovative fermentation bag holds your brew at the right temperature, which is one of the critical points in making good, flavorful beer. The compact design of the brewing bag makes it effortless to brew beer on the go, at events, or in places where you would not have room for full beer making equipment. Simply freeze a 2 liter soda bottle with water, or similar, and place in the fermentation bag with a fermenting carboy. 6.5 gallon, 6 gallon, or 5 gallon carboys of beer fit inside to chill.