The beer growler is a half-gallon glass or ceramic jug commonly sold at breweries and brewpubs as a means to sell draft beer to-go. Growlers started off in the 1890s as covered pails, used to carry beer back and forth between homes and workplaces. It's said that the name "growler" comes from the sound they made as carbon dioxide was released from under the lid. Over time growlers have taken different forms, from clear bottles, to cardboard containers. Once packaged beer became available on the market growlers were no longer needed and disappeared over the years.