This really doesn't belong on this site, but I'm stuck with no place else to ask. I know what I want and have found bags that come close but aren't perfect. I've got a 13" MB Air which I transport only occasionally. I mostly want it for work. I ride a bike to the train station, so I need a shoulder strap. I want the smallest and lightest pack that can hold incidental stuff including my iPad, occasionally my MB Air. The closest I've come so far is the Tumi Alpha Bravo. Next up was the Timbuk2 Commander but I wasn't crazy about it. I'll spend up to $200 or so. Is there a specialized forum anyone knows of to ask this stuff? Thanks.