The Big Gulp is a line of large fountain drinks sold at 7-Eleven convenience stores, known for popularizing oversized sodas in the U.S. since its introduction in 1980, starting with a 32-ounce cup and expanding to even larger sizes like the Super Big Gulp (44 oz) and Double Gulp (64 oz). It's a trademarked brand that includes a wide variety of flavors and has become an iconic part of American convenience store culture, though it has also been part of discussions about sugary drink consumption