I want to say that "a" Fisher Spacepen is my EDC but it is actually not just one. I keep misplacing or leaving in pants pockets so have multiples on hand. I will carry one every day, but not necessarily the same one. I keep these three on the dresser where I load my pockets every morning. There is also one in my vehicle and one in my briefcase at the office just in case I misplace one during the day. I've learned that when someone wants to borrow my pen, just to offer the pen part and keep hold of the cap. Otherwise they tend to disappear. Closed, the pen is about 3 inches. Open it's normal size.
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I've got the top one and am a big fan.