During my (European, thus I guess less challenging than American, Russian, African, Australian survivals as we don't have vast deserts, rainforest and extremely remote mountain ranges) survival trips over a decade, I've found out that the ideal survival knife must meet the following requirements:
Great cutter/slicer
Relatively light (less than 200 grams if possible - 6.8 oz)
Solid yet easy to sharpen with a small sharpening stone
Good grip
Weather/preferably rust resistant
Good balance
Blade length around 10 cm (4")
So apart from my Victorinox Huntsman or Outrider, my choice is Fällkniven F1 or S1. The only issue I'm having is that F1's edge retention could be a bit better so I am looking for a Dozier right now.