Has anyone bought this messenger case? It seems to be an "Apple exclusive", and one for us 12" iBook/PowerBook owners. I'm looking for a messenger bag/case for my iBook, and this one is tempting, being a Brenthaven and all. But I'm really wondering if it has any real protection against rain, since I'm living in a city where it rains approx. 260 days/yr... But I wanted to check if anyone had bought it, or seen it in "real life".