When I go out in the jungle I’ve got my Mora, a folding saw (much more useful for bamboo work than a knife) and usually one of my Thai jungle knives. I’ve got a video on YouTube about Thai jungle knives at
I’ve become extremely fond of small meed ito (ito knife) and they’re wonderful for chopping and splitting. The one in the photo came with a wooden handle that got loose fairly quickly, so I removed it and had a steel pipe welded on. The knife cost less than US$3… getting the handle welded on cost about $2. So, for $5 I’ve got a very useful tool that is a knife and a hatchet.
The sheath is just a piece of PVC pipe that I heated and smashed flat… then painted black.