Which iconic beverage's "contour bottle" design from 1915 was so distinctive it could supposedly be recognized in the dark or when broken?

In the world of pop culture, product packaging can become just as famous as the product itself. Some designs are so revolutionary they change the industry forever and become cultural touchstones. This trivia question explores one of the most influential packaging redesigns in beverage history that had a massive impact on pop culture and consumer behavior.

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Coca-Cola
Pepsi
Dr Pepper
Sprite