Generally, PC has good strength, but it has notch effect. ABS has good formability, but its strength is not as good as PC. generally, the pull rod box made of ABS + PC combines the advantages of ABS and PC, that is, plastic alloy. Therefore, the case made of ABS and PC can be used for the shell, and its wheel has good lubricity and wear resistance. ABS luggage: it is mainly characterized by light weight compared with other materials, flexible and rigid surface, impact resistance, better protection of the contents. Generally, adults can stand on it without any problem, and it is convenient to clean. The disadvantage is that it is easy to have scratches. After several times of collision during business trip or travel, the surface of the box will leave spots. PC case and bag: the main features are anti falling, water-proof, impact resistant, wear-resistant, fashionable, which can be said to be much stronger than ABS. It is the strongest one in the case, with smooth surface and good-looking appearance, and it will not worry about scratches due to rough handling. The biggest disadvantage is the heavy weight of the box due to its high hardness.