I'm looking for a fixed blade with a synthetic or kydex sheath that locks or straps the handle to the sheath so that there is no chance of it flying out at inappropriate moments, but still easy enough to get to in case of emergencies. Even though I almost always carry a folder for day-to-day business and a few fixed blades when I know I'm going to play in the woods, I'd like something stout enough to be a "survival" knife if something happened on a long trip and I didn't have anything else. Something that could preform well as a bug-out blade in case of emergencies where going home isn't a possibility. I'd prefer it to be carbon steel but not very expensive in case it ever gets stolen. I imagine this last requirement will knock out any of the custom blades. I suppose my best chance would be one of the military style blades. The primary requirement is that it locks/latches/straps to the sheath with little to no chance of coming out. Everything else is secondary.