Well, I can tell you what I
do carry: The EKA (Normark) Swede 92.
It's the top one in this photo:
(See the rest of that
photo spread here.)
I also have the EKA branded version of this knife, the Swede 92 (just like above but with black handle and EKA brand) and the wood-handled version, the Swede 82.
They're becoming kind of scarce, though, and I think they may be out of production. That would make me sad.
Notice the placement of the lock release: all the way back at the tail end of the handle. There is no grip what will accidentally release it (e.g. the infamous "gorilla grip"), and it's a really robust lock.
Another alternative is the other knife in that picture, also by EKA, the Nordic T8. Having put both of them through their paces, I have to say I still prefer the Swede 92 (or 82). (Another alternative by EKA is the SuperSwede, the forerunner to the Swede 92, and long since discontinued. They show up from time to time, though, and it's a heck of a knife. I have one that's my Jeep knife; it replaced a Buck 110.)
Now, if that is unavailable, there are a couple of very stout Spyderco offerings that would hold up nicely, and Buck makes the full-sized 110
Folding Hunter and the slightly smaller 112
Ranger. The Ranger is only available in 420HC (which is just fine for a blade steel), but the 110 is available through their custom program with upgraded steels, like S30V.
In each of our BoB configurations, we have a fixed blade, a single blade folder (Buck 110), a Leatherman Wave, and a small folder (can't remember if it's a SAK or a sodbuster).
For me, the only part of that which isn't redundant is the fixed blade, and if I have my truck, then I also have multiples of that.
Speaking of the truck . . .
Something else you might consider, if they're still available, is the Buck
Revolution. I have a Buck
Short Revolution in my truck. It's a plain edge, not serrated. Although this is technically a "folder," it's really a fixed blade & tang, with a handle that pivots to expose either the blade or the carabiner. It has a button lock that keeps it from opening accidentally, but the fundamental design of the knife won't let it close on your hand. I'm real happy with mine, and I would buy another plain edged version in a heartbeat. Somehow, though, all I've been seeing is the combo edge. The carabiner makes it easy to attach to your gear or hang from a belt loop. Robust little sucker. It would make a fine backup knife.