🥛 1. Expansion and contraction control
Milk expands when it freezes and contracts when it warms up.
The dent allows the jug to flex as the milk changes temperature.
Without it, pressure from expanding milk could burst the jug or distort its shape.
💨 2. Pressure absorption
If the jug is dropped or squeezed, the dent helps absorb the impact
It acts like a shock absorber, preventing cracks and spills.
During manufacturing and transport, this small feature helps maintain the jug’s structure.
🧴 3. Structural stability
The dent adds rigidity and strength to the plastic container, similar to how an arch adds strength to a bridge.
This design lets the jug use less plastic while still being durable — saving material and cost.
⚠️ 4. Safety indicator for spoilage
If the milk spoils and gas builds up inside, the pressure causes the dent to bulge outward.
This can serve as a visual warning that the milk has gone bad.
So, that little dent is a smart bit of engineering and safety design — keeping your milk fresh, your jug sturdy, and your fridge clean
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