A 330 ml beverage can

Cylinder Volume and Material Cost

The 330 ml on the can is not advertising, it is a legally binding promise: 330 ml has to come out of it. The maker cannot touch that number. The only thing left to change is the shape — and that isn't free either, because metal is bought by the square centimetre. Infinitely many cylinders hold the same 330 ml. They do not all cost the same.