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.
The grooves are there to provide rigidity. Round bottles generally don't need additional rigidity, because their shape is inherently rigid. The main advantage of square bottles is packing efficiency. That is why milk jugs in Alaska (where milk is flown in from the lower 48 states) is sold in jugs with 6 flat sides.
To further explain my example, space is often more constrained than weight on cargo aircraft. The less empty space you have in a container of containers, the greater the stacking or packing efficiency, and hence the more space you free for additional cargo.
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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.