Maß (pronounced [ˈmaːs]) or Mass (Swiss and Bavarian spelling, elsewhere used for dialectal [ˈmas]) is the German word describing the amount of beer in a regulation mug, in modern times exactly 1 liter (33.8 U.S. fl oz; 1.8 imp pt). Maß is also a common abbreviation for Maßkrug, the handled drinking vessel containing it, ubiquitous in Bavarian beer gardens and beer halls, and a staple of Oktoberfest. This vessel is often referred to as a beer mug by English speakers, and can be correctly called a beer stein only if it is made of stoneware and capable of holding a regulation Maß of beer.