The traditional port glass holds 6½ ounces (190 mL) and is 6 inches (15 cm) high. It is shaped like a small version of a red wine glass. Some people feel the traditional glass does not do justice to the wine’s complexity, and that port should be served in a much larger glass. In England (2003), glasses with a capacity of 450 mL are marketed as port glasses.
Do I need a traditional port glass?
Traditionally port glasses hold only about 6 1/2 ounces of this flavorful beverage and stand 6 inches high. It is basically the same shape as a Bordeaux wine glass just a smaller version. Many people feel this specialty glass does not do justice to the complex aromatics of port wine. In some countries glasses with capacities of up to 15 ounces are marketed as port glasses. Whether you decide to go traditional or bold be sure to never fill the wine glass more than half way.