I wouldn't say a loose opening back quiver because if you trip and fall forward you may get a face full of broadheads,, my opinion for the most practical has to be the GFA style,, you can do anything with that quiver,, here check this out..
1. you can mod it with straps to mount to a riser, or use a bicycle tube cut in strips
2. you can wear it as a back quiver
3. you can wear it as a belt quiver
4. you can attach it to a horse or a back pack.
5. you can make who ever is walking behind you carry it for you.
6. you can cram your lunch in-between the arrows.
7. you can have a sheath made that snaps around the main rod that holds the top and bottom together.
8, it can be modded to hold a tenkara rod for those stream side moments when you wish you had a tenkara rod.
9. everyone smiles when they have one.