The peak design bags have dividers they refer to as origami dividers. The majority of the volume of the bag can be customized using the dividers.
The is a laptop sleeve between the back of the bag and the main compartment. In that sleeve there is a divider. I believe the divider is meant to separate a 15" mac book and full sized ipad. The sleeve is large enough for my 14" laptop and my 12" laptop. Additionally, the sections you use to get in to the main compartment have padded organizers.
The bag is really clever and seems to be incredibly well built, time will tell on that.
Also, you mention a lot of gear fits. Do you have this gear just tossed in there or are there enough compartments for the list you mention?