For most of my recent trips, I only took a small point & shoot camera instead of my D40x, so I would need only one carry on bag. I really want to take my D90 to Macworld Expo, so I started shopping around for a case that can hold both a laptop and a full sized DSLR camera. I decided on LowePro’s FastPack 250. It has a camera compartment accessible from the side that will hold the D90 with the 18-105mm lens attached, plus several other compartments for additional lenses and accessories. A compartment in the rear will hold a 15″ laptop, and there are several other pockets for accessories.