I made a run to my local Marshall's and TJ Maxx stores, no luck with HT but I did find this Under Armour bag of similar build. I have some concerns about the longevity of the pack in a hunting application but for $13 it was worth a try.
Ridge Runner fits in the main pocket with ease. The secondary zipper pocket is enormous. With a little bit of creative folding and shoving, I was able to fit my Flex with LB in a dump pouch in the zipper pocket. (Not sure the zipper will hold longterm). Everything should fit better when I switch to Sterling rope this offseason.
I hope it works well for my needs which are protecting the inside of my pack, or noise and strap abrasion if I am carrying it externally.