Im not sure what youre suggesting I should do.
I am using 3ds max, and have made the root inside the backpack.
The bone on the bottom of the strap is the parent of the rest of the bones in the chain, but I need the final bone on that chain to keep its position relative from the root bone. That way the rest of the bones in the chain just wiggle around and dont tear away from the top or bottom when gravity is applied.
This is a picture of what happens when gravity is applied in the engine:
