Selecting the material depends on the balance between weight and protection. For frequent air travel, 100% Polycarbonate (PC) is recommended due to its high impact resistance and flexibility, which prevents cracking under pressure. For budget-conscious retail, ABS is cost-effective but more brittle. For premium business markets, Aluminum-Magnesium alloy offers maximum security and a high-end aesthetic, though it is heavier. For soft-shell preferences, Ballistic Nylon or high-denier Polyester (1680D+) provides excellent tear resistance and expandability.