Outstanding in every way! I carry a 7D and 1 series body with a 500 f4, 100-400, 300 f4, 24-105, 17-40, 2 teleconverters and 2 flashes along with assorted filters and stuff. I find the back pack part to be extremely comfortable. I love the fact that it is international airline carry on compatible.
The Gura Gear Kiboko bag is top notch. The bag was designed by safari photographer Andy Biggs, and he spent quite some time on the design. All the materials in the bag are top quality.
This bag is designed for travel as it is extremely lightweight. It works very well for international travel and can hold quite a bit of gear. It's not meant to be gate-checked and rolled around in an indoor shooting event--the Think Tank Airport Security is better for that. It's a bag to "get up and go" and has great backpack features.
Here's a link to a post on Andy's blog that lists some gear they were able to fit inside: link
And a link to further specs, images of the bag packed, info and price: link
Fabulous bag. Got mine in January and wouldn't be without it. Hiked 4 miles with it in February in snow and hilly country with no issues at all and love the amount of gear can get in and the ease of access. As mentioned, airline carry on compatible. Kiboko in Swahili is Hippo. When you open it, you'll see why.