A Maß or Mass is an old unit of measurement of liquid. Literally translated, it means mass. It is equal to 1.069 litre. Today, it is only used for measuring quantities of beer (one litre). Beer is usually served as 0.2 or 0.3 l (small beer) or as 0.5 l (big beer), but at some occasions (like the Oktoberfest) and some places it is also served as a Maß.