I haven't needed to take an offhand shot in many years. I've always been able to find a rest of some kind. I always carry 1 trekking pole which has many uses including as an improvised rest. With a little practice, you can use the pole against your leg or in many other ways to steady a rifle. One trick that works great is from a kneeling position. Hold the pole and the small end of a twig with the same hand. Pull away from the bush and lay the rifle over your wrist. The pole will control height and twig will keep it from swaying.
The pole is also a great hiking and balance aid for us older guys.
