Purpose of the Circular Dent on Milk Jugs

I’ll admit it—I’ve stared at that small, round dent on the side of a milk jug way too many times. You know the one. It looks like a little inward bump, almost like it’s hiding a secret. And guess what? It actually is! Most people assume it’s just a random mark from manufacturing, but nope. That dent has a real purpose—a smart one.

So grab your cereal, pour some milk, and let’s figure out why this tiny dent exists. It’s not a mistake or just for looks. It’s there for safety, function, and strength. Here’s the breakdown.

First, let’s talk about pressure. Milk is perishable, so it needs to stay cold. But temperatures change—like when milk goes from a warm truck to a cold fridge. When liquids get colder, they shrink a little, and when they warm up,

they expand. The dent gives the jug some flexibility to handle these changes without cracking or bursting. Think of it as the milk jug’s built-in stress reliever. Read more below

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