Still using this:
The 128 sits in a HAMA case, but there’s some space on the sides so it doesn’t fit snugly. Quick tip: if you can fit the USB cable put it on the base side, not on the keypads side as they might get stuck if you leave it in for long…
The 64 (old version) is so snug it’s sometimes hard to zip the case up.
I would recommend CD cases for light (cosmetic) protection, but not for padding since they don’t provide much protection against pressure or impacts.