The Secret Function of the Circular Dent on Milk Jugs
Most of us never notice it—the small, pressed-in circle on the side of your milk jug. It seems insignificant, yet it quietly performs multiple important jobs. Once you understand its purpose, you’ll never look at milk the same way again.
Built-In Pressure Valve
Every time milk travels from truck to store to fridge, the liquid expands and contracts. The circular dent acts like a built-in pressure valve. It flexes outward as the milk swells, preventing the jug from splitting, leaking, or even exploding. This small design absorbs stress silently, protecting both your fridge and your floor.
