The Surprising Purpose of the Circular Dent on Milk Jugs Most of us have noticed that little round dent on the side of a plastic milk jug. “I’ll admit it — I’ve stared at that tiny mystery circle more times than I can count.” You know the one—it looks like a small indentation, like someone pressed in a tiny button. Maybe you assumed it was a factory mistake or just decorative. But actually, that circular dent has a very smart job. Why Milk Jugs Have That Dent That dent isn’t an accident. It’s a key part of the jug’s design…
