>>882000if I could only take one knife, i'd take pic related - great blade, and the most comfortable handle I have ever used on a knife.
Thing is - pretty much any knife is multi purpose. The trick, is that the most important part when it comes to making the knife as functional as possible is not the blade (cough, tom brown tracker, cough), but the handle.
If you want your knife to be very functional, you need to be able to hold the knife in many ways, not just saber/hammer grip.
The blade just needs to be small enough - Mors suggests 4 fingers long (about 3-4 inches, depending on how fat your fingers are).
General consensus on a good "survival" knife is a blade ~4'' long, spear point, or drop point, usually scandi grind (full flat, and a reasonably high saber works too, but scandi is best for wood, and that will be the primary use of a survival knife - you can cut meat with anything).
Full tang (this includes hidden tang type knives as long as they are high quality and durable), with a very comfortable handle (can't stress this enough) with no silly finger grooves, guards, etc.
1/8'' thick (forget 1/4'' thick monsters), quality steel (O1, A2, 3V, even 1095 with a good heat treat, rarely stainless, or super steels like s35vn)
