Marathon is a chocolate bar consisting of an 8 inch length of braided caramel covered chocolate. It was manufactured by Mars Inc and first sold in the United States in August 1973. The bright red packaging had printed on it a ruler with inch (8) and cm (20) markings on the reverse demonstrating that it was as long as it claimed. (The length was the result of its braided shape; it did not weigh more than standard candy bars.) It was discontinued in October 1981. There was also a 15' version of The Marathon Bar sold in Southern California at local 7/11 stores and at Michael's Pharmacy in Swarthmore, Pennsylvania. These had a 15' ruler on the back of the red wrapper.
Contributions by Fourohfour, SmackBot, and 22.214.171.124.