Right now my backpack with camera, 3 lenses and a MBP is. I want to save weight and space and get a lighter bag that I can carry around everywhere. I use my computer for work, but the camera is just for fun. I'm not a pro photographer, but I like using proper equipment. The laptop that I am planning to get and use the bag with is a MacBook Air. Maybe one of the new alu 13" MacBooks, but I like the weight of the Air. The camera is a 350D (aka.rebel xt) and I would at least need to hold a 17-40 f4L that would be mounted on the camera all the time. If it could hold more lenses that would be nice too. Having tried a 5D I want one of those With the 24-105 f4L! With the mk2 there's video and also it seems that the of range of that lens on the camera is good for walking around and being a tourist. Reducing weight and keeping it simple - not needing to change lenses - is what I want. So if I decide to get a 5D at some point I would want the bag to fit that as well. It would be nice if I could have it over my shoulder and quickly just take the camera out of the bag to take a picture. And the same for the MacBook (Air): easy to just take it out of the bag. Lastly it should be easy to use for travelling - going through airports, walking around in the city etc. Perhaps a little pocket for holding passport and tickets would be nice.