I use a combo of backpack stuffed with small pillows that you can lay on ground, angled on fence post , in branches of a tree or bushes on the ground OR my BogPod with PSR rest. With either of these I've made shots out to 565 yds. with my handguns and 719 with a friends with a rifle scope. I've tried many other "items" and positions, but these two have proven to be excellent the last 50 years of my handgun hunting.
Most backpacks have a little "hangy loop" on top. I've found if you put a screw in bow hanger on a tree at head heigth and hand the backpack on it, plus rest your forearm on the tree, it's about stable as a bench.