ABS and PC is well know as material of hardshell luggage. However, PET Luggage is popular in market the last two years because of it's advantages. PET is called Polyethylene terephthalate which is a ecofriendly plastic. PET luggage is expensive than ABS luggage but cheaper than PC. PET material's advantages as below: LOW TEMPERATURE RESISTANCE SCRATCH RESISTANCE MUCH MORE SHINY THAN ABS