This is the pen you need in your everyday carry. Why? It can write at any angle, in temperatures from -30F to 250F. Doing some fieldwork in Antarctica? No problem. Writing inside an oven? No sweat! The Fisher Space Pen has got you covered.
This is the same pen that is featured in the New York Museum of Modern Art as an example of "outstanding industrial art". It's a classic, and it only runs around $21.