Most back quivers are made of the wrong material to be quiet, lined with fur or made with the hair on is quiet,
also it forces you to walk quietly, which is something that takes concentration,
the back quiver, if the design is right also allows you a place to carry survival components,
I always have a bushman located in a special pouch inside the quiver,
along with a few survival items in the pocket, so I don't have to have them sloshing around in my pockets,
fletching are duller colors, as a quiver full of bright arrows is like a flashlite in the woods (those colors are better for target or where concealment is not an issue)