A hoi hoi Michelle, The leather I used is 3-4mm thick veg tanned leather. This was mostly due to me using the leather I had on me at the time, but also because I was a bit worried it wouldn't have enough structure as a newbie. This was my first large leather project. I made a bow holster using 2-3mm thick veg-tanned recently based on the Met Museum's Tibetan Cavalryman's bow holster to pair with the quiver. It's definitely sturdy enough but I would not go any thinner, especially if there's sewing involved.
