For you guys using fairly squishy material for a rear bag, highly recommend doing a lot of practice off of them. For me, I will OFTEN send the first shot high with a squishy rear rest. Might be my shooting technique but it is repeatable enough to be concerning. I’m talking 500 yards plus, dedicated long range stuff. Definitely used game bags, puffys, and bino harness for shorter ranges and been fine.
Git lite is what I would use for fill, regardless of the actual bag.
Personally have been loving my LRO mini wedge.