Prepared mustard is generally sold at retail in glass jars or plastic bottles although in Europe it is often marketed in metal, squeezable tubes.
In Poland, during the early communist period, mustard was sold in small glass jars without twist opening. In the communist economy almost all commodities were in shortage, so mustard jars ware commonly used as glasses ("musztardówka" in Polish). This resulted in the phenomenon of "mustard glasses," used mostly for vodka. Similarly in Germany, most mustard brands package the mustard in a drinking-glass shaped jar, and indeed Bautzner Senf has produced promotional series' of decorated jars featuring childrens' tv characters, with a view to them being used as children's drinking vessels.