David King Leather Backpacks and Waistpacks are a classy way to carry those smaller things in life. Each bag is conveniently made with adjustable straps and helpful pockets. David King uses full-grain, naked, Vacquetta leather. Vacquetta leather is known for its durability and classic aging. Natural oils create a hint of sheen (patina) that darkens the leather over time.
PROS: The leather, as described, is incredible and will age well. I've had this bag for ~1 year now and use it to/from the office and the back & base sides are already becoming shiny with age. I can't wait to see what this bag looks like in a few years. I love all the compartments -- they're all useful. My 15" mac pro fits with lots of extra room.
CONS: I use it as a backpack. As a messenger is uncomfortable as the bag is pretty large & long. The straps, leather, require some wiggling to get into the backpack. But if you don't have particularly delicate clothing and only take it on/off once or twice a day, it's ok. If you frequently need to drop pack and go, it would be too annoying.