When sourcing bags, material quality directly impacts your return rate and brand reputation. For leather goods, distinguish between Full-Grain, Top-Grain, and Genuine Leather; for synthetic options, prioritize High-Density PU or Eco-friendly RPET fabrics. Ensure the denier count (e.g., 600D, 1680D) for nylon or polyester bags meets the durability requirements for their intended use, such as travel or outdoor sports. Additionally, verify that hardware components like zippers (e.g., YKK or SBS brands) and buckles are electroplated to prevent rust and oxidation.