Which iconic soda brand's bottle design from 1915 was intentionally created to be recognizable even when broken or felt in the dark?

Throughout history, some product packaging designs have become as iconic as the products themselves. These design choices not only protected the contents but also created lasting brand recognition that transcended generations. This poll tests your knowledge of one of the most famous packaging evolutions in consumer product history - a design so successful it's now in museums worldwide.

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Coca-Cola's contour bottle (aka the 'hobble skirt' design)
Pepsi's swirl bottle
Dr Pepper's 'I'm a Pepper' bottle
7UP's 'bubble' bottle