Fisher Space Pen Trekker Keyring Pen

Fisher Space Pen is the brand that put a reliable ballpoint in the hands of NASA astronauts. Paul C. Fisher developed a sealed, pressurized refill so ink flows when ordinary pens fail—upside down, through grease, in heat and cold, and in zero gravity. Decades later, Fisher still manufactures many models in the United States to the same demanding standard.

The Fisher Backpacker is made to hang on a keyring or lanyard so you always have a real pen—not a gimmick. The compact body hides a full pressurized cartridge: the same technology that writes underwater, over grease, and in temperature extremes. Aluminum construction keeps weight down for EDC and travel.

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