I'm with Rifleman2 on the 2 legged Bi-Fur Pods that are on VarmintAl's site (although he also shows you how to add the 3rd leg). I often walk through thorny vines and the Bi-Fur Pods work great to help me make it through those. I use them to maintain balance both up and down snowy and muddy hills too.
They're highly useful and adjustible for use sitting, kneeling or standing.
He's right about their ability to quickly and quietly move or simply be dropped out of the way when Wiley comes in from a direction where you need to change position.