Here is my new Hill 22" RH quiver (stiff leather version). I just treated it inside and out, with the Montana Pitch-Blend Leather Oil & Conditioner product.
(This image is very slightly lighter looking than it actually is, due to the settings chosen by my phone camera):
The MPB oil darkened the unfinished side of the leather (top cuff and inside), but just a little. When you first apply it (I used their horsehair brush to apply) it got really dark. But after it soaked in, and I rubbed it down with a cotton cloth, the original color returned, only slightly "richer" looking.
I also treated the suede string pouch. This pouch soaked in a lot of the product, so even after I wiped it down and pressed it for a while inside some paper towels with a book on top, it stayed darker and the nap was matted in places. I was able to fix most of the nap matting by brushing with a suede nap brush. So the pouch is quite a bit darker than originally, but again, I like the look. Eventually the soft suede would have absorbed dirt and finger oils anyway, and started looking stained. So again, I don't mind the darkening here, either.