Well, I guess I should add my thoughts at this point.

SWK has a copyright on the product design (the unique arrangement of the pockets, zippers, flaps, etc), the actual type of fabric is not really a key factor. I designed our cargo sporran, starting with rough sketches, then made prototype patterns using CAD software and personally sewed the prototypes. The result has been a sporran that many people have found to be useful, which is personally rewarding to me above and beyond any income derived from my design (trust me, I will not be able to retire off of my sporran profits- we really try to keep the prices reasonable)

Based on our research, SWK cannot "officially" give permission for someone to reproduce our design (even if just for personal use) because we are legally required to defend our copyright. Privately, it's not really a big deal to me if someone wants to try to copy one for their own use, but if you are going to make that sort of effort, why not come up with a new design?

For those interested in getting the "real deal", we hope to have big batch of nylon and leather cargo sporrans ready this summer, if not sooner.