Ted Thorn and I each made our own versions of a sling keeper unbeknownst to each other. There were a couple threads on these at the backpack hunting forum last winter. Basically, I'd tried the Dark Mountain "Slingsaver", and found it essentially worthless as its wrap-around strap rubbed into my shoulder making it raw... I chucked it in the trash and built my own.

Here's the link for more:

https://www.24hourcampfire.com/ubbth..._Pack_Rifle_Sling_Keeper...#Post11081646

“Perfection is Achieved Not When There Is Nothing More to Add, But When There Is Nothing Left to Take Away” Antoine de Saint-Exupery