Cellar Rats Brewery in Madison has started bottling its Black Rat Imperial Stout. The beer is available in four-packs at the brewery only starting today (Wednesday). "I am toying with the idea of a small release into the market for the winter," brewery Director of Sales and Marketing Joel Sandrey said in an email. Cellar Rats describes the milk stout as a "monster beer" at 9.2 percent alcohol. Cellar Rats just started bottling earlier this year. The Black Rat joins Rat Tail Ale, Field Rat Wheat and Piper's IPA in bottles. Like Black Rat, Field Rat and Piper's IPA are available only at the brewery. "We have Rat Tail Ale across the market in both retail and restaurants and are thrilled with the response we are hearing to our beer," Sandrey said.