Also a type of glass, an old fashioned is used for drinks that have mostly alcohol, and little or no soda in it. They hold about 6 oz. so the bartender will usually give you about two ice cubes. Old Fashioneds are easily confused with the Double Old, as they are both glasses that are similar in shape. The Old Fashioned differs from the Double Old in that the D.O is heavier and slightly bigger than the Old Fashioned. One can assume that the Old Fashioned was used mainly for the drink that bears it's name.