Bag loaded with 10D and attached 17-40 L lens. 700-300 DO IS lens with hood is shown on the right, with room for two other smaller lenses or p/s camera or flash. There are tabs just beneath the shoulder strap on each end that unsnap, and allow the bag to extend up 2-3 inches, making more room in the bag. The top horizontal edges of the padding have stiffening in them so that they pull back and stay secured when the tabs are unsnapped, and expose the entire contents of the bag. This makes it very easy to operate out of when the bag is on your shoulder. The bag came with inserts that can be arranged as needed. On the sides and ends between the padding and the body of the bag, there is space large enough for filters/memory cards and other flat objects.

The bag will accommodate two bodies with medium zooms attached / hoods reversed if placed end-to-end and slightly canted off center. I have done this, placing one of the padded inserts between the two facing lenses.