Mountain Dew is a citrus-flavored carbonated soft drink brand produced and owned by PepsiCo. It is available in varying sizes and packages; glass bottles (35cl), P.E.T bottles (50cl) and can (33cl). The original formula was invented in the 1940s by two Tennessee beverage bottlers, Barney and Ally Hartman, and was first marketed in Marion, VA, Knoxville and Johnson City, Tennessee. A revised formula was created by Bill Bridgforth in 1958. The Mountain Dew brand and production rights were acquired by the Pepsi-Cola company in 1964.