I have a number of pens stashed about so that one is always nearby when needed: a spare Zebra F-402 in my EDC pack, a 402 and a 701 in my truck bag (one blue, one black), a cup full of various pens on my desk at home... all see use, but infrequently and I'm worried about them drying up and not working when I need them. My father's Cross Century Classic still writes, if weakly, with it's original 70s-era cartridge. My 90's Fisher Cap-o-matic still writes weakly on it's original cartridge as well. A newer (5 years or so) no-name pen with a Fisher refill still writes quite boldly even after being run over by a car in the parking lot where I found it. However, I bought a Parker Frontier ballpoint about 6.5 years ago but never really used it. Recently, I needed a Parker refill for my Bastion Bolt pen so I grabbed the Frontier's refill since it was essentially unused, and it wrote well for about a month but now I cannot write the date without it failing, so I assume it's dried up. I've read that Parker refills have a shelf life of about two years, but I'm hoping to find something that can store more long-term so that my pens will work when I need them. I'd like to stock up some Zebra and Parker refills (my two most common), and I'm looking for two things: What suggestions do you have for pen refills with a long shelf life? What suggestions do you have for storing refills to maximize their shelf life?