When sourcing handmade leather bags, the material is the most critical factor. Prioritize Full-Grain Leather, which is the highest quality as it retains the natural grain and strength of the hide. For a premium 'handmade' feel, look for Vegetable-Tanned Leather, which uses natural tannins and develops a unique patina over time. Avoid 'genuine leather' labels without further specification, as this often refers to lower-grade split leather. Ensure the thickness is appropriate for the bag type—typically 1.2mm to 2.0mm for structured bags.