Why drink bottles design for round turned out to be a reason for that

A, mathematical Angle, cost savings. Must have the circumference, circular area biggest, suborbicular can save raw materials. The first to promote the cause of the circular. Second, the ugly aesthetic Angle, over a long period of time. A long time habit, round compared with aesthetics. Three, the craft is simple, the manufacture Angle. Glass or plastic circular are relatively easy to make, other shapes need to manufacture the mold, process is difficult to guarantee. Four, behavioral science Angle, easy to use. Circular accord with human body as a result, the convenient grip strength.