What inspired the shape of the Coca-Cola contour bottle?

The iconic Coca-Cola bottle was the result of a design brief issued by The Coca-Cola Company.

To avoid confusion with copycat brands, the Root Glass Company in Terra Haute, Indiana, was tasked with creating a package that was “so distinctive that it could be recognised by touch alone and so unique it could be identified when shattered on the ground.” The result was a glass bottle inspired by the curves and grooves of the gourd-shaped cocoa bean, an ingredient the designers originally thought was in the product.