LizThis thing is light, is reinforced, and made for head phones but it has been the best case I've found. It holds up to 4 pens, I wish it was a little bit taller/wider to fit the pens better and I also wish it had individual pouches.
http://www.meeaudio.com/EP-Case-M6PRO-MEE/
I wish I could find something similar but with pouches for my pens....looks like I might just have to get China to make me some and sell it to everyone.
SativaDroI forgot I can attach photos for you.. I had these cases made to fit my Kaweco pens - a single Kaweco and one that would hold all 4. I read reviews that the leather Kaweco holder doesn't have room to hold a pen with the clip on. I sent measurements to the seller and they made them for me :)
TherocTheroc.. did you check them out... I don't remember if I attached the link... I a going to order a few other of the leather cases for single and double standard size FP's.