I've tried Harris bipods which are great from the bench. Not nearly as exciting as the bipod above, but for hunting, I used Bipod Shooting Sticks for years elk hunting in CO, and deer hunting in several different terrains. They work great in sitting, standing positions, and probably prone as well which I've not tried. They stay in my backpack year around. The video is pretty corny but let you know how they work.
http://bipodshootingsticks.com
