The ‘Secret’ Behind Red Solo Cups — The Owners Dish on the Uses of the Cups

America's favorite party cup -- the REAL uses and understandings of all of the lines might surprise you. 

According to Yahoo:

Starting from the bottom up, they mark one ounce (a perfect shot of bourbon for your Boulevardier or gin for your Negroni); five ounces (a standard wine pour); 12 ounces (a typical can of soda or beer); 16 ounces (aka a pint); and the final 18-ounce mark for any overflow from ice.