A crowler is a large, sealed can used for packaging draft beer. Typically, it holds 32 ounces, making it a convenient option for customers who want to take home fresh beer from a brewery. The name "crowler" is a combination of "can" and "growler," which refers to a smaller glass container for beer. Crowlers are filled directly from the tap and sealed on-site, ensuring the beer remains fresh and carbonated. They are often made of aluminum, which helps protect the beer from light and oxygen, preserving its flavor. Many breweries offer crowlers as a way to provide customers with a portable option for enjoying their craft beers.