The pen doesn't post. While capped the whole assembly is as long as a normal Jetstream retractable pen, but when you are writing with it, the pen is closer to the length of the One P. The caribiner is fairly thick. This will be my pocket pen, as being attached to my keys will make it harder to lose than a pocket zento signature. I have no complaints about the ink, if you have used a 0.5mm Jetstream refill, this is another. Although the smaller capacity multi-pen style refill.
