Jsasker; They are commonly referred to as back quivers. I use one for 3D shoots and roving that will hold 2 dozen arrows for both my wife and myself. I also use a smaller one that holds 6 arrows for small game hunting and roving. I also use a bow quiver on my longbow. Each quiver has it's good and bad qualities, so I try and use the best one for the situation.

Problems with a back quiver is that unless you put something like oatmeal or sawdust inside of the quiver to keep your arrows seperated, the arrows will rub together, dulling broadheads and making noise as you walk. You will also lose your arrows if you happen to bend over at the waste, like to pick up an arrow or something else off of the ground. Side quivers if you tie them to the leg, make your arrows swing as you walk, creating a flagging motion and the fletch gets torn up in brush and such. Both the back quiver and side quiver create a lot of hand motion when you draw an arrow. Bow quivers also create a flagging motion but not nearly as bad as a side quiver will and they keep your arrows handy so that one can be removed with little hand movement. Another quiver is one that hangs at your side. There are several designs and some hide the arrow and protect them from the weather. The side stalker quiver and the plains or Lakota style Indian quivers are also an excellent design and can be made to completely cover the fletch, protecting them from brush and weather and making the arrows readily accessable to the hunter without game spooking hand movement. If you go to the traditional board and post this question, there are a variety of quivers used by us that hang out there and you can get personal accounts on most of the quivers available to you.