The purpose of this research is to develop a system for evaluating product shape, from the viewpoint of aesthetics and packaging. In the previous work, we developed a robust design method to generate a product image based on customersâTM feelings, and we quantitatively evaluated the shape based on the principles of the Taguchi method. The underlying idea is that an attractive product with an aesthetically pleasing shape should enable efficient packaging. In this paper, we analyze the packaging efficiency of three different cross-section shapes (circle, square and rectangle) of an aesthetic PET bottle. The packaging efficiency is evaluated based on comparing the space required to contain bottles with the space available in the packaging box. The paper uses the assumption that the space required to contain bottles depends on the space to contain one bottle, and the space to contain one bottle depends on the largest cross-section of the bottle body. The system can give designers suggestions about the packaging efficiency of the designed model.