Re: What filling for rear bag?
If you want something that holds its shape and molds easily.
The pantyhose is better than poly beads, rice, or any loose filler.
And unless you only shoot from the bench, weight will matter.
Re: What filling for rear bag?
Fill it with old (clean) cut up pantyhose. Cut it into at least
4" to 6" pieces.
I bet you like better than the poly beads. It will be lighter,
and firmer yet easily molded into the shape you want for each shot.
Sow a loop on it so you can run carabiner through...