Materials: genuine leather (calfskin, crocodile leather, etc.), canvas, suede, environmentally friendly materials, etc.
Craftsmanship: hand-stitching, gold-plated metal parts, oil edge treatment and other details.
Size: length, width and height (cm/inch), capacity (whether it can hold A4 documents, mobile phones, etc.).
Structure: number of compartments, zipper/magnetic buckle design, shoulder strap adjustability, etc.