Purpose of the Circular Dent on Milk Jugs..

Most of us have noticed that small, round indentation on the side of a plastic milk jug. I’ll admit it—I’ve stared at that little mystery circle more times than I can count. You know the one: the pushed-in circle that seems like it might be a factory slip-up or maybe even decorative. But it’s neither. That little dent has a very real—and very clever—purpose.

So, grab your cereal, pour some milk, and let’s reveal exactly why that dent exists.

3 Big Reasons the Milk Jug Dent Exists

That indentation isn’t an accident. It’s an intentional part of the jug’s design, created for safety, durability, and strength.

1. It Helps Manage Pressure

Milk is a liquid, and liquids react to temperature changes. Since milk has to stay cold, any shift in temperature—like going from a warm delivery truck to a cold fridge—causes the liquid to expand or contract.Continue reading…