The pen that truly Goes Anywhere, Writes Everywhere and attaches to everything! The Backpacker Space Pen can hang upside down forever yet function immediately when needed. This pen has been a fan favorite for years due to its ease of carrying. Attach this to your keys, backpack, belt loop, hiking gear, fishing sling, 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 pressurized PR style ink refill cartridge, which means that they offer all of the unique capabilities that are synonymous with Fisher products: they will write upside down - at any angle, under water, through grease, extreme temperatures (-30 to +250 degrees F), on almost any surface, three times longer than the average pen, and of course in the gravity free vacuum of space, and all of our pens are lifetime guaranteed for quality against all manufacturing defects. About Fisher Space Pens Fisher Space Pen is a family-owned company in the United States that revolutionized the pen industry with the invention of the “Universal Cartridge Refill” – a sealed and pressurized ink cartridge that literally launched the company into space in 1967. Debuting on the Apollo 7 mission in 1968, Fisher Space Pen has been on every NASA manned space flight since. Our products have also managed to find themselves onboard the International Space Station and have been utilized by the Russian and Chinese space programs, as well! In fact, Fisher Space Pen now has its own permanent exhibit inside the Apollo/Saturn V Center at Kennedy Space Center, which proudly shares our history and products with some three million people a year. Famous Fisher Space Pens: Own a Piece of American History! Unmatched Industry Distinctness Fisher Space Pens are famous due to their use by NASA during Debuting the Apollo 7 mission in 1968. Normal ballpoint pens expose the ink to air and rely on gravity – which wouldn’t work in space at zero-gravity – while our specialized ink cartridges rely on pressurized gas that won’t leak or dry up. This allows the pen to write at any angle (including upside down), in extreme temperatures (-30F to +250F), on almost any surface, underwater, through grease, and, of course, in space. Pressurized Cartridges The secret behind the unique capabilities of our pens lies in the ink cartridge itself. Our refills contain thixotropic ink and are hermetically sealed, pressurized with nitrogen gas, and feature a tungsten carbide ballpoint tip. To prevent leaks, Fisher ink is actually more of a gel than a liquid when it is at rest, but when pressure is applied to the ballpoint, the ink becomes spreadable, while still retaining the stickiness required to adhere to nearly any material. Quality Commitment When it comes to pens, if you’re anything like us you can’t settle with just any old plastic ballpoint. You expect and deserve more from your pens - much more. To ensure the highest quality, our products are both hand- and machine-tested, so you can write confidently with the knowledge that your Fisher Space Pen will never let you down! Bullet Space Pen in Black Cap-O-Matic Space Pen in Black The Original Astronaut Space Pen in Chrome Bullet Space Pen in Chrome CLUTCH Space Pen Cerakote Space Pen in Tungsten Buying Options Add to Cart Add to Cart Add to Cart Add to Cart Buying Options Customer Reviews 4.7 out of 5 stars 3,136 4.6 out of 5 stars 4,499 4.7 out of 5 stars 3,209 4.8 out of 5 stars 1,448 4.6 out of 5 stars 1,051 4.7 out of 5 stars 404 Price — no data $23.95$23.95 $71.10$71.10 $28.80$28.80 $53.10$53.10 — no data Model S400BCL SM4B AG7 S400 Clutch 400H-237 Available in other colors ✓ ✓ ✓ ✓ ✓ ✓ Size when open 5.35” x .38” 5.27” x .38” 5.0” x .375” 5.35” x .38” 5.45” x .52” 5.35” x .38”
