I'm not sure about jewel cases, but I have just migrated my large collection of CDs
and CDRs to "JewelSleeves".
I can highly recommend them - each sleeve can hold the artwork (front and back)
from a commercially released CD/jewelcase, as well as an index tab that allows you
to label them as you prefer... each sleeve can also comfortably accommodate 2
discs - 1 on either side of the soft synthetic pad inside the vinyl jewelsleeve (and 3 if
you squeeze them in tight - good for 3-disc concert recordings you are likely to not
access very frequently).
They also take up about 1/3rd the space of jewel cases...
A picture or two here:
I have no affiliation with them whatsoever - just a very satisfied customer...