Ok, odd question:
What is it about pens? When I check other people's gear lists everyone lists a pen as their writing instrument, if they have one.
Why not a simple wood pencil?
A pencil is less likely to explode or leak ink during altitude changes. Generally more rugged. Easily sharpened with your knife/razor/teeth/whatever. You immediate know how much life is left in it merely by looking at it. Pretty idiot-proof. Erasable.
So why does everyone carry pens instead?
Are they more multi-use? Do you plan to use the tubular body for your emergency back-country cricothyroidotomy or something? (Because THAT won't work- believe me.)
What am I missing?

