Wait—So That’s What the Circular Dent on a Milk Jug Actually Means!

Not usually. The dent itself generally does not release pressure like a valve. Instead, the plastic may flex as pressure changes. The precise function depends on the jug’s design and manufacturer.

The Interesting Lesson Behind This Everyday Object

Sometimes, the objects we use every day have features we rarely stop to examine. A milk jug’s indentation is a good reminder that packaging design involves more thought than simply creating a container that holds liquid.

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