Looking for the perfect camera bag

As a photographer and an avid traveller, I’m always on the hunt for a comfortable, inconspicuous, secure, lightweight, convenient, and rainproof camera bag. That’s not too much to ask, is it?

Well, this bag, the Retro5, is being discussed on my favorite photography blog, Digital Photography School, at  http://www.digital-photography-school.com/think-tank-photo-retrospective-5-the-new-baby. This bag looks like it could be a winner, particularly for my trip to Argentina and Chile in the Fall. If anyone has any experience with this product or family of products, feel free to comment or contact me!