I was searching for a case for my Roland TD20.
I have mailed Thomann and I got a very fast answer and they recommended me the Thon Case for the TD-30.
My TD20 fits in very well and there is lots of more space under it. Under my TD I have my headphone amplier and my in-ears, cables, adapters etc.
I have also buyed the Thon case for my SPD-SX Sampler. Also a great case!!!