When sourcing from Guangzhou, the global hub for leather goods, quality varies significantly by district. You must prioritize material authenticity, checking for Full-Grain or Top-Grain leather versus synthetic PU/PVC. Inspect the hardware quality, ensuring zippers (like YKK or high-end local brands) operate smoothly and have electroplated finishes that resist oxidation. Pay close attention to stitching density (typically 6-8 stitches per inch for premium goods) and edge paint thickness, which should be smooth and uniform without bubbles.