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The Reason Behind the Circular Dent on Milk Jugs

The Purpose of the Circular Dent on Milk Jugs

Almost all plastic milk jugs feature a circular indent. But what’s its real purpose?

Not Just for Decoration

The indent isn’t there for decoration. It has a practical purpose, one that many people may not even notice. A recent social media post sparked hundreds of comments about the mystery of the circular dent. One Facebook user, Cory Anderson, suggested, “The milk is going bad when it pops out.” However, others had different ideas.

Protection Against Expansion

Some believe the indent helps the jug expand in cold weather. Andrew Serpico explained, “The bubble gives the milk somewhere to expand so it won’t bust the carton if you freeze it.”

More Than Just a Mold

The indent, also known as a mold, is crucial for the jug’s strength. According to The Dairy Alliance, it helps the container hold milk securely and ensures the correct amount is poured into each jug. Spoiled milk has nothing to do with the indent. As the Dairy Alliance notes, “The indent wouldn’t pop out just because the milk is a little too old.”

Regulating Temperature and Size

The indent also plays a role in protecting milk from temperature fluctuations. In warmer weather, plastic shrinks, but the larger indent prevents milk from overflowing. During cooler months, the indent is smaller, but customers still receive the same quantity of milk year-round.

Controlling Production Costs

The indent helps maintain customer satisfaction by preventing spills and ensuring bottles appear full. As noted by product development experts Lauren Joshi and John Cowan, high-density polyethylene (HDPE) containers shrink post-manufacturing. The indent ensures milk production runs smoothly, reducing waste and controlling costs.

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