In case anyone is interested, I found a small zippered bag that perfectly fits the ToneWood Amp. It's $8 on Amazon. It is the ERCRYSTO Universal Electronics/ Accessories Soft Carrying Case Bag (Small).
It has a main compartment that fits the ToneWood, and two mesh pockets, one of which I use for the cable.
Apparently ToneWood does not allow links to external sites (which is reasonable — neither does Amazon), so the link above does not work. If you search on Amazon for the ERCRYSTO Universal Electronics/ Accessories Soft Carrying Case, you should find the item pictured. I bought the one circled in red.
Guess I was too hasty. When the link I posted yesterday did not appear, I posted the screenshot of the Amazon page today, thinking that external links were not allowed in this forum. Then both appeared simultaneously this afternoon.
Thanks for posting that suggestion -- I ordered it even before my TWA arrived, and everything fit just perfectly. I ordered the slightly more expensive version with the two pouches -- the smaller one for the TWA and cables and spare batteries, and the larger one other accessories to keep organized when traveling. For the price, it's a great bargain!
Great find, I am interested in purchasing.