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In 1974, 7-Up became the first American soft drink to use the metric measurement system. As evidenced by this button, the move presented a massive marketing opportunity due to the national interest in metrication.
The rebranding coincided with Congress passing the Metric Conversion Act of 1975, which sparked official metric-conversion efforts. 7-Up participated in these efforts by producing Metric Education Kits for distribution in U.S. schools. This interest in metric declined during the early 1980s, however, but 7-Up and other sodas continue to use the alternative measuring system.
Baxter, Annie. (2017, October 10). "Why does soda come in liters and milk in gallons?" Retrieved from https://www.marketplace.org/2017/10/10/business/why-does-soda-come-liter....
Department of Commerce, National Bureau of Standards. (1977). Report of the 61st National Conference on Weights and Measures, 1976.