I have only had a couple of bag targets. I got them so long ago that I don't remember who made them, but arrows always tended to hang up in them. The back of the head seemed to hang up in the bag fabric, not the filler. The filler looked like polyester batting such as you would find in a pillow and works fairly well. I haven't seen any filler that looked like netting.
I almost bought a bag target not long ago but decided to splurge and get a 3D deer instead. I'm glad I did. Also, I have used several foam targets. They have worked well, but the center will shoot out.