A Brief History: How the Design Evolved
Before plastic, milk was delivered in glass bottles — sturdy but heavy, expensive, and prone to breaking.
In the 1950s–60s, the dairy industry adopted high-density polyethylene (HDPE) plastic: lightweight, affordable, and unbreakable.
But early jugs had issues:
- They leaked as milk expanded.
- They buckled when stacked.
- They sometimes split open during transport.
The circular dent solved it all — allowing the jug to breathe, stay strong, and flex under pressure. Today, it’s a standard feature on nearly every milk jug worldwide.
