+1 on Chris' points about the BCB wire saw. They have done quite well in my tests. You can get them here from the great folks at Best Glide.

Originally Posted By: Tom_L
With my GB Small Forest Axe I can easily chop down pretty sizeable trees. Let's say anywhere up to 8" with relatively little effort and a good deal bigger than that if I really had to. Good luck trying to cut down a tree that size with your pocket knife or multitool saw.


Good luck fitting that axe into a palm-sized survival kit.