The Backpacker Space Pen truly goes anywhere, writes everywhere, and attaches to everything! This pen can hang upside down forever yet function immediately when needed. This pen has been a fan favourite for years due to its ease of carry. Attach this to your keys, backpack, belt loop, hiking gear, camping equipment, and much more. The Backpacker is a two-piece pen with a key ring attached to the cap of the pen. Each carries a pressurised ink refill cartridge, which means that they offer all of the unique capabilities that are synonymous with Fisher they will write upside down - at any angle, under water, through grease, extreme temperatures (-34 to +121 degrees C), on almost any surface, three times longer than the average pen, and of course in the gravity-free vacuum of space.

Features:
Write at any angle, including upside down.
Write on paper that is greasy or wet - they even write underwater.
Fisher Space Pens don't leak or ooze.
Ink lasts approximately three times longer than other ballpoint pens.