Hi all- anyone have any opinions about handlebar bags? I've been using a backpack to ride with my E-M5 and 4 lenses (3 small primes + 12-50), but I'm not in love with this setup. First- HOT- my back has been crazy sweaty under the pack this summer. Second- SLOW- I'll see something to photograph, stop, sling off the pack, unzipper, pull out the camera, shoot, put back in pack, zipper, sling back on, keep riding. This is ponderous. I'm thinking by having the camera right in front of me on the bars I could almost stop the bike and grab the camera in the same motion, shoot, and go. I was looking at this one, the Topeak TourGuide, which is not really listed as a "camera bag", but is padded & comes with a rain cover. I keep all my lenses in separate padded neoprene drawstring sleeves, so I'm not concerned that there aren't dedicated lens pockets. Any other suggestions?