I ordered these:
https://www.amazon.com/-...
Unfortunately no CH delivery. Therefore via Meineinkauf.ch It's expensive, but I hope it's worth it.
I haven't found a Swiss supplier for anything comparable.

I just made one myself. Small box with a lid, maybe make a few partitions with cardboard. More expensive and beautiful is of course always possible... ;)

I bought a Cube like this a long time ago. It didn't come with a bag or anything similar.
The cassettes have to be stored separately.

Yes, it is delivered without, I don't know if there is one.