Enamel cup for half a liter of beer, or soup, or coffee, or engine oil, or screws and nuts, or pudding, or Vodka, or fuel, or red wine, or brake fluid, or what ever you want. Anything that tastes good is allowed.
Made in Austria by Riess - which is why the mug is characterized by a closed "lip" on the drinking rim. This ensures a better feeling when drinking and dirt does not accumulate either.