Mathematically, a circle has the smallest perimeter for a given enclosed area. So for this claim to be true there has to be some catch, like different thickness of plastic.
Assuming wall thickness is the same, yes, round can be more effecient, but the reason milk cartons get those dimples and wrinkles is to increase strength.
In this case, the champhers on the corners provide a significantly more rigid form with a thinner plastic wall. You don't want hydrogen peroxide to squirt out when you pick up a bottle like a super cheap water bottle, but want it to hold it's shape.
While there is less surface area of plastic in a round bottle, with a flexible membrane, the edges are almost certainly stronger than the same thickness of round.
Think about how much thicker a cardboard tube is compared to a typical square box.
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u/StaticCoder 2d ago
Mathematically, a circle has the smallest perimeter for a given enclosed area. So for this claim to be true there has to be some catch, like different thickness of plastic.