If you poke around an outdoor store, or even a college bookstore, you're liable to find a bunch of fanny pack TYPE rigs that can work as a sporran. Usually they're nylon.

Tell you what though, The Stillwater nylon sporran not only fits the bill - you'll become addicted to the convenience of the thing (There's a large rabble pounding at the door of Stillwater to get that puppy done up in leather...)

The other option is AmeriKilts and their cloth "sporrans" that come with their kilts. Or just go with a Freedom Kilt or Utilikilt with pockets and you'll have no need of a sporran.

But "formal" no leather, no fur, is almost an oxymoron.

Ron