Which soft drink brand was first to introduce the 'contour bottle' design that became so iconic it could be recognized by touch alone in the dark?

Test your knowledge about one of the most recognizable packaging innovations in pop culture history! Many iconic brands have transformed their packaging over time, creating cultural touchpoints that transcend the product itself. This particular packaging change sparked controversy, nostalgia, and ultimately changed how an entire industry approached product design. Can you identify this pivotal moment in pop culture packaging history?

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Coca-Cola (1915)
Pepsi (1934)
Dr Pepper (1923)
7UP (1929)