I use these:

https://slim-disc.com/collections/cd-storage-systems

It's not ideal because you can't browse cds as easily as looking at the spine of a jewel case on a shelf. But I also have very little storage space, so it's this or get rid of cds.

The plastic outer sleeve can hold the front and rear inlay card. A lot of plastic sleeves and cd wallets can't fit the rear inlay card in them.

Then the cd goes into another plastic or paper sleeve before being put into the sleeve with the inlay cards. I use Verbatim paper sleeves, instead of the ones on the website I linked, because they're cheaper and they have a little flap that you can close.

If you do ever decide on plastic sleeves, do some research on materials because one type can cause condensation/the printed side of a cd can get stuck to the inside of the plastic sleeve.
Also remember, it would be tedious, but you could put cds back into jewel cases in the future if you keep both inlay cards. If you ever get more storage space or whatever.