The Athlete Pack is designed for gear up to about 6" tall. Let's breakout the specifications and measurements for camera gear. The Origami Camera Core (TM) allows you to shift space into and away from the camera section. The first photo includes the full storage capacity. The second photo shows how the top fold has been pulled in and this space is no longer accessible for camera gear.

What makes the Athlete Pack so unique? It's all the wrinkles you see in the photos. It's because this one pack can be setup and sized anywhere between 20 and 40 liters.
The Athlete Pack shown above, I've packed about 25 liters worth of gear. That's plenty for a day trip be it city or trails. At this size, the Athlete Pack is just 7" / 18cm deep on the outside and the hip belt can easily be removed and stowed.