The Rifle Support Bag, from Edgar Sherman Designs, is exactly what it sounds like. This versatile rifle bag can be used a number of ways including as a rear support bag under the stock, looped onto the forend of your rifle as a barricade rest, and more.
The bag is made with a flexible fabric that allows to the stretch and conform to your hand and the rifle. It includes an elastic strap for placing over your hand or the forend of your rifle. It’s asymmetric fill media holds its shape better than typical round media and it includes two webbing loops for tying the Rifle Support Bag onto your stock.
That thing is really well thought out, easy to use and light. I had the opportunity to play with the one of the early prototypes.