When shooting outdoors, I find the Crumpler 7MDH a little inadequate, especially when I want to use my superzoom Sigma 150-500mm lens. I needed a sling-type bag that allows for quick retrieval to equipment, and at the same time can also be setup like a backpack. After doing my research, I settled for the Kata 3N1-30. You can see it below compared to my existing smaller Lowepro Photo Runner and Crumpler 7MDH.
Read my review at DPreview and see more pictures of the bag.