HAS IT BEEN
SINCE I'VE USED THIS?
The ones you haven't used EVER go first (of course I mean ones that you haven't just purchased. If you spent all that money on a cartridge (or even got it for free) and haven't used it ever, it's not worth keeping!
Now go through the ones you haven't used in years.
What are you holding onto these for?
Is that word "someday" coming out of your mouth right now? "Someday I will need it."
Who do you think you're fooling, certainly not yourself. Put it in the box. Be strict with yourself and keep just the ones you need.
I own three, yet, just three have met all my needs. See them here.