Like any other photographer that has been around as long as I have, I have collected a lot of camera bags and cases. Below are the ones I use every day.
MindShift Gear PhotoCross 13
This has become one of my favorite camera bags for travel photography around Europe! It holds a camera and three to four lenses and I can attach my tripod to the bag.
Think Tank Pro Speed Belt V2.0
Instead of a heavy backpack, I prefer the Think Tanks Belt System. It takes the weight off my back and placed it on my hips along with allowing me to change lenses easier.