A growler is a container, typically made of glass, ceramic, or stainless steel, used to transport draft beer from a brewery or taproom. They usually hold 32 or 64 ounces of liquid and are designed to keep the beer fresh and carbonated. Many breweries sell their beer in growlers, allowing customers to enjoy fresh, local brews at home. To use a growler, it is important to fill it properly to minimize air exposure, which can affect the beer's taste. After filling, the growler should be sealed tightly with a cap or swing-top to maintain freshness. Some breweries also offer crowlers, which are similar but made from aluminum cans.