I've just received a lovely new case for my Gaillard, made in leather, stiffened and padded, from Gilles Garneret. It wasn't cheap, but, given the cost of the box, I thought it was worth having an attractive, well-made case with a strap to go on a shoulder as well as a handle. The leather is quite substantial, and stiffer than a gig bag; and it's lined with the same sort of padding that you get in gig bags. It certainly should be waterproof in all but the wettest of conditions. Overall, I would say good protection for much-loved instrument.
Gilles has a website at
http://www.anchesetcuirs.fr, and has been a pleasure to deal with. I don't know what his English is like, but communication with me has been prompt, friendly and business-like. The waiting time was about six months, but he delivered exactly when he said he would, at the price he quoted. There are plenty of photos of his work on the website, in a variety of designs, colours etc.
I'm posting this because I'm not aware of anyone else making box-specific cases in leather, so I thought it might be of interest. (Incidentally, I'm sure that someone like Simon, at
http://leatherforfolkies.co.uk would be able to do something similar, if you approached him. He designed and made excellent cases for my pipes, and was great to deal with.)
I've no commercial interest in either enterprise, but I'm a very satisfied customer, and given the nature of one or two recent threads, I thought good products and service worth mentioning!