When compared to other plastics used in hard-shell suitcases, ABS is the most rigid one. However, the rigidness doesn't account for durability because polypropylene and polycarbonate are much more ...

Polypropylene (PP) is a thermoplastic that has a number of properties that sets it apart from other thermoplastics which see common use with 3D printing, including PLA, ABS and nylon (PA).