At first glance, that dent might look like a manufacturing flaw or some kind of accidental indentation. But in truth, that tiny dip in the plastic isn’t a mistake at all. It’s a clever piece of engineering that plays a major role in how your milk jug works — and it’s one of those small details that quietly makes life easier and safer.
If you’ve ever taken a carton of milk out of the fridge and noticed a small round dent on the side of the jug, you’re not alone — but you’re also not alone if you never gave it a second thought.
The Dairy Alliance says, ‘The indent helps control the amount of milk filled and strengthens the jug enough to hold the nutritious milk inside.’ They also said, ‘The design, especially that mysterious circular indent, is all about function. It strengthens the structure so it doesn’t burst under pressure, and it helps accommodate the expanding and contracting that comes from changing temperatures.’
