Everything about this messenger is heavy duty! The type of construction, the leather, the closures...it's a lifetime bag for sure! Leather is 9 oz latigo which is super thick and able to stand up to almost anything! Natural veg tan is used for the closure straps and around the sides. There is also a veg tan pocket panel inside which is removable. All the hardware is solid brass and the flap closes securely with premium pull snaps.