According to John Kimmich, the brewer of The Alchemist, Heady Topper is a unicorn beer built specifically for the can. “All that carbonation is coming out, the CO2 is escaping, the aroma, the hop essence, and oils,” Kimmich said. “When you drink it out of the can, the beer is perfectly preserved. There’s a layer of CO2 riding through that can, and when you pour the beer into an empty glass, you’re immediately accelerating the expulsion of all that goodness.”