What bones are the best to use for a backpack item?

Acksor

I'm working on a project that would go on Soldier's back (underneath whatever banner he's using), and I'm unsure of what bone to use for it. This is my first project ever using Blender, so it's been a learning experience all the way. Just getting kind of stumped on this one. I know that hats use bip_head, but would I use a spine bone for a back item?

Baddcog

You can use as many bones as you need for correct placement/flexing.

Acksor

So as long as I have my model parented to the bone it won't matter?

Baddcog

I skin it to whatever bones it needs, then export the item and the entire skeleton.