The thickness of leather is a physical feature of leather that is used to tell customers how thick and heavy the leather is. Leather’s thickness is usually measured in ounces with one ounce being 0.4 mm thick.
Sources accessed (10th March 2023):
Pen case pencil case leather pencil case leather pen case pen pouch vintage brown leather
Pannier saddle bag with shoulder strap bike bag large canvas leather brown 16 liter
Wallet card holder coin billfold wallet petite folding women’s men’s brown leather