Why Do Milk Jugs Have Circles Built Into Their Sides? Details!

Have you ever noticed that many gallon milk jugs have circular indentations in their sides? There’s a very fascinating reason for that!

10 Uses for Plastic Milk Jugs: Don't Just Recycle - REUSE! - Thrifty Jinxy

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This Is Why Your Milk Jug Has a Circle On Its Side

Spectra - S2 Plus Electric Breast Milk Pump for Baby Feeding - Convenient Breast Feeding Support : Electric Double Breast Feeding Pumps : Baby

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Why Do Milk Jugs Have Those Inverted Circles?

The Inverted Circles On Milk Jugs Let You Know If It Has Gone Bad

What is this concave circle on the side of my milk jug? There's only one, there isn't an opposite shape on the other side.. : r/whatisthisthing

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