Be the life of the party with this totally cool retro 7-Eleven Slurpee logo hoodie! 7-Eleven is a worldwide chain of convenience stores. It is, since March 2007, the largest chain store in any category, beating McDonald's by 1,000 stores. Its stores are located in eighteen countries, with its largest markets being Japan, the United States, Taiwan, and Thailand. 7-Eleven is a subsidiary of Seven & I Holdings Co. of Japan. Among 7-Eleven offerings are private label products, including Slurpee, a partially frozen beverage introduced in 1967, and the Big Gulp introduced in 1980 that packaged soft drinks in large cups ranging in size from 20 to 64 fluid ounces.