Had the first AW Lowepro 500 but that was in spite of genius too large and on the bike to unkonfortabel for me.
It is striking deep cut, an advantage if a battery pack or vertical shutter release on the camera, but without would fit inside of my Sony A57 almost two superimposed and match it falls through the area. Even with the remodeling and fixing Velcro straps they did not stabilize. So lapses.
The second attempt was the Montana SLR backpack trekking. It fit everything pure (albeit just so), and he is not uncomfortable - as long as you do not ride a bike. For me it was this extremely oppressive to the thoracic spine and thus out of the race.
As between mass bezgl. Size and price, it is now the Lowepro 400AW and I'm thrilled.
It fits into all and because the depth is just right, it is very easy to carry and go.
The build quality is excellent (if it proves itself permanently).
In contrast to Montana, he has front still similar generous pocket for batteries, filters etc. and a snack, jacket
All for the price is really worth 6 stars for me. Absolute buy recommendation.