What the Circular Dent Is For: A Small Feature with Big Benefits | August 8, 2025

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What the Circular Dent Is For: A Small Feature with Big Benefits

At first glance, the small circular dent on the side of a plastic milk jug might seem insignificant—or even like a manufacturing flaw. But this amazing design feature is far from accidental. In fact, it plays vital roles that improve the functionality, durability, and sustainability of the jug. From controlling pressure to aiding in recycling, this clever detail depics how thoughtful engineering can make everyday products more efficient and eco-friendly.

Managing Pressure Inside the Jug

When a milk jug is filled, the liquid inside exerts pressure on its walls. This pressure can increase further due to temperature changes or rough handling during transport. The circular dent works as a flex point, allowing the jug to expand or contract slightly without cracking or warping.