GauchoViejo brought up a good point, one I've experienced before ... two piece pens ... and losing one of the pieces..either by mis-laying a piece or having them come unscrewed, uncapped or whatever.
I like pics of the cut-down BIC or whatever it is. Am a big fan of keeping the cost low, just on principal alone and naturally this allows me to "salt" pens everywhere with little concern over expenditures. Since just like knives ... the best one you can have is the one you have with you !

And whomever brought up space pens not drying up .... I believe you are right. I haven't thrown out my last Space Pen Refill (hoping to get one that didn't spit out globs....have had it for over a decade and it writes each time I try it .... and no I don't have a capped style Space Pen body ... its a Sensa Pen my wife bought me that takes Space Pen refills and it's design doesn't use a cap ...but I like the theory of cap interference ... had not thought of that.

Manufacture date is also a issue with more than pen cartridges ... besides other pens no longer being made I really liked, the moving off-shore or cheaping out of the products today, makes it always a possibility that what works great today ...won't on the coming years.

As for the drying up issue ...this is one I've battled with pens in the e-kits....and those I keep in my cars....and have not found resolution. My EDC pen gets used every day. I don't leave the house without a pen in my pocket whether I'm going to work or not.

Thanks to all for their thoughts, ideas and experiences ... I'll be looking into INKA refills as a result.

--KW