+1 for kreigaI have the KreigaR25- it has a option for a back armor or a hydration pack. It has a stiff molding which will surely protect your back in a light crash. They have a quad lock system which securely straps to the chest. I have never had problems with backpacks- just make sure you have a chest strap- and a abdomen strap as well if you can- for a more secure fit. And no loose straps flying around.
Looks good. Really good.http://www.yamahafz09.com/forum/members/429-albums54-picture1131.jpg . This is the best one I've seen Steve. Thanks Luke, It's one my bike all the time