There are absolutely knife rolls for fixed blade knives, you can get them at any better kitchen supply place or at a knife store that sells kitchen knives. Some cover the whole knife, some only the blade, some are slot in and some are snap open for each knife.
A knife roll may not be as sexy as a nice box, but it is a very good way to transport knives, and is much more portable. For example maybe you need to run out of the house with just a few essentials because of a fire or some such; which would you rather have to carry with your boxes of documents, photos, etc.: a box or a roll?
A lot of chefs that use carbon steel knives put those little packets of silica that you get every time you buy electronics or wool in with the knives in the roll. Once in a while you rotate them so the silica packets dry out. I have no idea how that would work with natural handles like bone or wood though, so use some due dilligence.