When sourcing hard luggage, the material determines the price point and durability. Polycarbonate (PC) is the premium choice, known for being impact-resistant and flexible, meaning it flexes under pressure rather than cracking. Aluminum offers the highest security and durability but is heavy and expensive. ABS (Acrylonitrile Butadiene Styrene) is the most cost-effective and lightweight option, though it is more prone to cracking under extreme stress. For a balanced mid-range market, PC+ABS composites are highly recommended as they offer a glossy finish and improved toughness at a competitive price.