The well-made, but something heavy backpack up and on the sides. Openings that are too small even for a medium-sized DLSR as an Olympus E-5 The height of the side flaps is not sufficient. The Zuiko 50-200 and its large lens hood you get them neither from the side still top in no longer fumbling.
As a sling bag, just as feasible, I can not recommend the backpack. Therefore, only 3 points.
