Well, I don't always (OK, usually) like to pack a tripod around with me. I'm lazy
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One of my good friends hunts, and he's got several little beanbag-type thingies that he uses when he shoots a rifle to set the rifle barrel on. They're leather, and sort of form little pouches. I know they sell little beanbag things just for photography for this purpose, but when I can just borrow this thing for free? It works great! I use it all the time to prop the camera on a fence post or a rock or in the branch of a tree to steady a shot. They come in different sizes and you can add or remove fill as needed, and even if you purchase one new I'm fairly certain that they're more inexpensive in the hunting supply at ~$20 that in the photography supply that I've seen at ~$30-$40.