Polypropylene suitcase

  Choosing the right hard-shell luggage comes down to how a material handles real-world stress. A suitcase on a transit belt faces impact drops, heavy stacking compression, wheel friction, and freezing cargo temperatures—all while staying within strict airline weight limits.   If you are trying to determine the best luggage material for long-term travel, the short answer depends on how you travel. Here is a quick breakdown of how the four main hard-shell materials stack up.   Quick Answer: Material Positioning   Polycarbonate (PC): Best overall choice for frequent international travel and checked luggage due to high impact resistance and flexibility.   Polypropylene (PP): Lightest hard-shell material, offering strong crack resistance for strict weight li...