Material selection is the most critical factor in determining the price and lifespan of a handbag. For Genuine Leather, verify if it is Full-Grain or Top-Grain, as these offer the highest durability and prestige. For PU or Synthetic Leather, ensure it has a thickness of at least 1.0mm and passes hydrolysis resistance tests to prevent peeling. If sourcing fabric bags (canvas/nylon), check the Denier (D) count; a higher denier (e.g., 600D or 900D) indicates better tear resistance. Always request colorfastness test reports to ensure the dye does not rub off on the end-user's clothing.