Why Do Plastic Milk Jugs Have a Large Dimple on the Side? #Video

You’ve probably seen it a hundred times—that large dent on the side of a plastic milk jug. It looks random, maybe even like a flaw in the design. But in reality, that simple indentation is doing far more than you might expect.

In this video, we break down the real reason behind that dimple and how it helps make milk jugs stronger, cheaper, and more efficient. From structural support and material savings to pressure control and even visual design, this small detail plays a surprisingly big role in everyday packaging.
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