MillerCoors LLC has begun testing the sale of $20 draft-beer systems for consumers to drink at home, part of a string of new products and package innovation from beer giants grappling for market share in a crowded, slow-growing industry.

MillerCoors, the second-largest U.S. brewer by revenue, has begun testing the 1.5-gallon "Home Draft" for its biggest brands -- Miller Lite and Coors Light -- in about a half-dozen cities, including Dallas, Phoenix and San Diego. The boxed product, which is designed to fit into refrigerators for drinkers to consume periodically, rather than for one-time party use, comes amid packaging overhauls by the U.S. units of Heineken NV and Anheuser-Busch InBev NV. Read more...