I spoke too soon, FWIW it looks like MLD might stock these:
http://www.mountainlaureldesigns.com/shop/product_info.php?products_id=77

They're noisy, or at least when you first get them, but they really are super light and pack small, so that I'll sometimes toss them in if I'm not sure that I need them.

Note that if you don't have a shell jacket that's cut pretty long, these can look a little --- kinky. A bit less noticeable when it's raining hard and folks have their heads down, but still, a heads up on that aspect.

I wouldn't see them as the idea gear for sitting around in camp, however.