I made my own vertical filter holders here: DIY filter holders.
You could make it for any length. I had a few narrow slots in my hard case foam and they slip in easily. I made four of them and they hold 12 filters, plus I can see what they are through the clear plastic.
I made my own vertical filter holders here: DIY filter holders.
You could make it for any length. I had a few narrow slots in my hard case foam and they slip in easily. I made four of them and they hold 12 filters, plus I can see what they are through the clear plastic.