Buck 486 - the Bucklite Max Large folder
Like many people here, I do things in the backcountry that could have consequences. Biggest threats I face are hypothermia (by far) and being injured in a fall. I struggle with the adjective "survival" being applied to my knife, since it equally applies to everything else I take - survival tarp, survival stove, survival clothing, survival pack, survival repair kit. I count ounces following Chouinard's addage that "speed is safety". Realistically, 90% of my use of a knife is for food prep. I prefer a single blade folder with a blade in the 3.5" range and it must be incredibly light. I carry this type of folder in conjunction with a Leatherman PS4 Squirt as a part of my Survival Repair kit (seems odd to say it that way, doesn't it?). The 486 was the best Buck that I've owned for this purpose to date. I'll also use my pocket knife to make wood shavings to start a fire in the rare place that can be done. Unfortunately both of my Bucklite Max folders died early lives. I would love it if Buck produced a flat ground folder in this size range that was more durable and south of 3 oz. Someday I'll try the large Vantage.
There is one kind of trip where I pack a fixed blade. On long remote ski tours that follow rivers (and thus stay down in the hardwoods mostly), I carry a folding fire stove (Emberlit) instead of a white gas or alcohol stove. Wood is plentiful and the Emberlit can be easily run for hours at a time with minimal energy spent on wood gathering and processing. I carry a folding saw and fixe blade with a 4" to 5" blade (weighs less than a fuel bottle). If I had to replace my old Schrade-Walden, I would be very interested in the new Selkirk. I would be even more interested in the Selkirk if they put that blade in a 100 series phenolic handle (or even a rubberized Bucklite Max handle) and made it in the US.
I have axes and hatchets and machete. None of them get carried in my pack. I just don't go places and do things that would justify the weight.