Why Soda Bottles Have Those Weird Feet on the Bottom
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Most people never think about the bottom of a soda bottle, but that strange shape is one of the smartest parts of the whole package. In this video, we explore why many plastic soda bottles use a five-foot “petaloid” base, how carbonation creates pressure inside the bottle, why a flat bottom would be a problem, and how engineers turned a strong rounded shape into a self-standing bottle. We also look at the rise of PET plastic bottles, Nathaniel Wyeth’s breakthrough work in the late 1960s and early 1970s, and why modern soda bottles still use this clever design today.
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