I use a woodstove in the backcountry and so I need to saw a lot of wood. I've used practically everything, and was mostly disapointed. And then I bought your old standard saw at a hardware store. It does not fold up but is actually quite light. I made a cardboard sheath and have never looked back. It is the type of saw (can't remember name brand) that you see in cartoons - you know 4 or 5 inches deep and 18 inches or so long with a handle at the back. But check out what they have at the hardware store. None of them are very expensive compared to 'true' hunting gear, and when they get dull you buy a new one. No folding handles that snap shut on your knuckles, no loose blades that don't cut straight etc.

Patrick