Thanks for all the information here!
I just wanted to give a little feedback about my search for the best bag for the Helix (for my needs):
As I don't want to leave my Helix in our band trailer to be able to tweak at home in between gigs, I prefer a sort of a softbag over a hardcase (weight, handy carrying, no hard/sharp edges that could damage the floor/car/furniture....).
But on the other side the bag must be well padded to protect the Helix from rude handling at our gigs, or (when there is no time for tweaking) - it should ever find itself in the trailer...
I looked for a skb softcase version which I like very much but couldn't find a good fitting one here in germany (SKB SC2111 unfortunately was a tiny bit too small and not compressable).
So I had to look somewhere else and tried the following ones:
Thomann Effect Pedal Bag
-> snaggy zippers, not very sturdy and no good fit.
-> better over all impression than the Thomann Bag, but a little too wide (61,6 cm vs. 55,8 cm) and padding is only 13 mm.
Ritter RKS7 Keyboard 550*310*110
-> fits perfectly, 28 mm padding and very sturdy material and reinforced edges, handy strap and handle, large outer pocket
I kept the Ritter and I'm very happy with it over some months now. It isn't advertised related to the Helix so it might be a little bit unknown here, but I can definetily recommend it!