The Coca-Cola king-size bottle was introduced in 1955 to offer more drink than the traditional six-and-a-half-ounce bottle.
For much of Coca-Cola’s early bottled history, the six-and-a-half-ounce package was a familiar standard. Changing consumer habits and the growth of self-service retail created demand for larger servings, so Coca-Cola introduced additional package sizes.
The king-size bottle gave the company a way to increase volume while preserving the recognizable Coca-Cola package identity. It was part of a broader shift in which Coca-Cola packaging expanded beyond a single standard bottle and later included larger glass, plastic, and metal containers.
“King-size” describes the package size, not a separate beverage formula or flavor. The phrase is also sometimes confused with later family-size packaging, which served a different household-sharing purpose.