Coca-Cola became the company’s first major cola packaged in a two-liter plastic bottle. The larger plastic package extended Coca-Cola’s branding into a format designed for home sharing and refrigerator storage.
The move reflected a broader change in soft-drink packaging. Glass bottles remained important, but lightweight polyethylene terephthalate, commonly called PET, allowed manufacturers to offer larger quantities without the weight and breakage associated with glass. Coca-Cola’s familiar red branding and script were adapted to the larger package.
This packaging milestone is sometimes confused with the introduction of cans, returnable glass bottles, or the six-bottle carrier. Those were separate innovations that appeared at different points in Coca-Cola’s history. The two-liter format belongs to the era when plastic packaging helped shift soft drinks toward family-size, take-home consumption.