Quote Originally Posted by Doc Hudson
It has been a while since I looked at the pattern, so Ill have to shoot from the hip on the dimensions.

It is a cylindrical shaped case that can vary in length and diameter. Opens end to end, not just on one end, and is closed by two or more buckled straps. IIRC there are also attachment straps for attaching to a saddle that could be used for attaching to other luggage.

The design is based on 17th Century Portmanteaus. As I should have known, there are already some commercially made portmanteaus available. Here is a photo of a pair from Triple K Leather
That looks perfect for the job -- for the kilt at least -- of course, the jacket, sporran, etc. will all need to go in something, too.