For a while I had been looking for a folding hiking stool to take with me on day trips. It needed to be small enough to fit inside my Osprey Daylite 13 litre backpack, and be reasonably lightweight yet functional.
I came across this steel tripod stool in Poundland for £1.00 (not everything is £1 any more). The maximum recommended load weight is 80kg which is 176lb or 12.5 stone. It is small, but if you sit on it in the same way as a bike saddle it works well. I much prefer it to sitting on the ground, and is comfortable enough for a short rest break.
As well as for walking, it will also be useful for camping. It is the perfect height to sit at for cooking on the portable BBQ or campfire.