A beer Growler is a 64 fl. oz. beer jug usually with a handle near the opening of the bottle for easy handling. While Growlers can be made of plastic or even stainless steel, Growlers are most commonly made from amber glass. There are also 32 fl. oz. (946 ml) mini Growlers available.
Most glass Growlers are compatible with a screw-on cap to provide a tight seal. When paired with the proper closure, Growlers can help keep beer and other carbonated beverages fresh when the entire contents are not consumed in one sitting.