These 1/2 gallon glass growlers are commonly used by both breweries and homebrewers with kegging systems for distributing their beer, four 16 oz pints at a time! Amber glass is darker and less penetrable by light than clear glass, thus giving the beer a layer of protection against photochemical reactions that can cause skunking. However, beer distributed in growlers should be drunk quickly. Be prepared by keeping a few of these around at all times!