I was also going to suggest banjo bros. I have the waterproof bag. It has the quick release mount, which looks identical to the one sedges linked to, detachable map holder, shoulder strap and exterior mesh side pockets. I haven't toured with it yet but it appears well made. Note - unlike Ortlieb, the waterproofing is due to the interior liner, not a waterproof exterior. http://www.banjobrothers.com/products/01067.php#