I have got the THON case for gigs as shown above. It's sturdy, light and the KPA fits smoothly inside.
For transporting it to rehearsal or other locations I also have this cheap Gator Bass Drum Pedal Bag.
It's just 20,- EUR at Thomann and built quite well for the price. Also the KPA fits nicely inside, the knobs are showing to the top side which makes them not so vulnerable although especially this side is cushioned really well.