I'm looking for a backpack to store my D7000 and 13" Macbook Pro, as well as a few spare lenses and other travel essentials. I'm a slender lady and I have pretty painful scoliosis, so I need any bag to be comfortable (read: good ergonomic support for the back, NOT a slingback), TSA compliant and relatively light. I'm going on an 11-day cruise and long honeymoon in two weeks, and I want to be able to securely and comfortably carry my gear. Any suggestions? Thanks!