That Circular Dent on Milk Jugs Isn’t Random — Here’s What It Really Does

4. Lower Material Use (and Cost)

Because the dent adds strength, manufacturers can often use less plastic overall while keeping the jug durable. That means lower production costs and a smaller material footprint per container.

5. Easier Crushing for Recycling

The design also helps jugs compress more predictably when crushed. Less trapped air, less awkward bulging, and more efficient transport and processing in recycling streams.

What It’s Not

  • Not a factory defect.
  • Not a “weak spot” that means the jug is about to fail.
  • Not a purely decorative choice.

If anything, it’s the opposite: it’s a quiet upgrade that makes a cheap plastic container perform like it’s been stress-tested — because it has.

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