
TWSBI is the best I’ve found at making fountain pens that completely seal when capped, although Kaweco is also quite good for that. I currently EDC a TWSBI Mini Vac, where the caps seals and the ink chamber can be separately sealed closed. After more than six months in my pocket it has yet to lead.
TWSBI also has some amazing technology for refilling the pen. If you use their special ink bottles, you can refill them without coming anywhere near the ink. You can also buy a “snorkel” that screws onto most of their models that does something similar with a regular ink bottle. (Note that the Eco, is one of their few models that does not support any of the fancy refilling options.)















This is why we haven’t actually had an apocalypse.