back in the old days i was buying CD-R in 10mm jewel cases. then came the 5mm “slim” jewel cases that allowd to store twice as many disks in same space. and now i see this :
so it says 3mm, but i think they might be FULL OF SHIT as right there it says its half standard thickness ( which would be 10/2 or 5 mm ) which would make it only a slim, not a “super” slim case.
if it were indeed 3mm that would be hot, cuz then i could store THREE disks in place of each one.
and here is another possibility which is intrigueing to me :
In my experience the clamshell cases suck. They’re difficult to keep closed, and have a distinctly unstackable shape. The little knob that’s supposed to keep them closed protrudes a little, and of course you can’t easily keep them on their edge.
If you’re interested in flexibility, I have some cases that are a flexible clear plastic sleeve, square, with a velvety cloth insert to protect the back of the CD. They’re a little bit thinner than the 5mm slim cases. A brief search online didn’t turn up an example, but I know they’re out there.
I use clamshell cases that I buy at Walmart. I buy the purple ones, but I’ve seen green too. I think it’s around $5 for a pack of 20. I’ve never had a problem with keeping them closed, and they don’t have anything protruding that prevents stacking them. I like them.