Backpackers are very serious about the size and weight of what they carry. If he packs a tripod, it will most likely displace something of importance... like what? well.. stove.. cloths.. food.. So making room might not be an option. The first thing we need to know is what camera is being brought along. We need to know how much weight we are discussing.
The local camera shop sells the trek-pod. As much as I like design concept, I wasn't too impressed by the products implimentation. It felt like such a compromise that it didn't do either (walking stick or tripod) very well. Then again, I require a good walking stick for long walks due to an injury. As such, I am biased towards comfort over functionality as a monopod.
Find a monopod/walking stick that makes you comfortable. Many walking staffs at the sporting good stores are equipped with a screw from which you can attach a small ball head. Height adjustment is usually limited but it might be good enough. Some monopods will be ideal functionality wise but too heavy. Your arms will let you know once your miles out in the middle of nowhere. Only you can decide how much comfort you require versus monopod functionality. Then take along some rubber strapes like these:
http://www.bongoties.com/. You can create a good platform from which to shoot from by taking your monopod/walking stick and strapping it to a tree, stump, fence, sign post or whatever you find in the woods. You can even create a tripod by strapping another two sticks to your monopod/walking stick (and tilting the head).
For me, I ended up with the Gitzo monotrek. Its design is closer to that of a walking stick rather than a monopod but works very well for me. Unfortunately, you need to be careful of weight ratings which the monotrek is limited to 4lbs. It comes with a small ball head. I made a rubber foot for it for times when I'm walking on pavement (it comes with a fixed steel tip). I also placed some tape at the bottom of the foam handle to keep it from sliding down during humid days.