That indentation isn’t an accident. It’s an intentional part of the jug’s design, created for safety, durability, and strength.
1. It Helps Manage Pressure
Milk is a liquid, and liquids react to temperature changes. Since milk has to stay cold, any shift in temperature—like going from a warm delivery truck to a cold fridge—causes the liquid to expand or contract.
Without it, the jug could bloat, crack, or even burst (especially if the milk freezes). The dent gives the plastic room to adjust—like the jug’s built-in stress reliever.
