Did you look in the motorcycle sub section? There are people who specialize in motorcycle leather. Most chrome tan leather would be to flimsy for bags I would think. If you glued 3oz veg tan to the back side it would firm it up and give you the “body” for the chrome tan to hold its shape better. And I’d put Aussie,Sno Seal or the like on the veg tan to help make it more water resistant.