In addition, the quality of these plastic bottles is also dependent on the quality of the purchase. When designing squeeze plastic bottles, if the material is high-density polyethylene or polypropylene, the cross-section of the plastic bottle should be rectangular or oval. Oval plastic bottles have higher rigidity, but the manufacturing cost of the mold is higher. Therefore, the edges and corners of the plastic bottle should be designed with rounded corners.

In order to facilitate the stacking of plastic bottles and increase the stacking stability of plastic bottles, the bottom of the plastic bottles should be designed with internal grooves. The design of the plastic bottle mouth should be focused on; consider how to make the plastic bottle mouth better match the lid and sealer to the bottom of the plastic bottle, easter printed eggs which is the weak part of the mechanical properties of the plastic bottle. The plastic parts used in conjunction with the plastic bottle mouth are mainly bottle caps and sealers.

Changing the surface shape of the plastic bottle, for example, the middle part of the plastic bottle is relatively thinner, and increasing the circumferential groove or rib on the surface of the plastic bottle can improve the rigidity and bending resistance of the plastic bottle. Therefore, the bottom of the plastic bottle is generally designed to be concave; the corners of the plastic bottle, and the concave part, are all over the larger arc., so these parts should be designed with rounded corners.

The edge and corner part is the last contact part of the parison inflated, and the wall thickness of this part is small. A 'frame' can be designed on the surface of the plastic bottle, so that the label can be positioned accurately without movement. Longitudinal grooves or ribs can eliminate deviation, sagging or deformation of plastic bottles under long-term load. The printing surface should be flat and continuous; if the plastic bottle contains handles, grooves, ribs and other structures, the design should be careful not to cause inconvenience to the printing operation. 

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