I will be going to India/Tibet from September through December, and then to Costa Rica from January to May. I don't know about Costa Rica yet, but for India I will be taking a large internal frame backpack as my main suitcase. I will, however, need some sort of daypack and/or something to carry my laptop ('bout a 15"er) and camera gear in (D200, couple of lenses, flash if i decide to take it, batteries, flash cards, etc.). Does anyone have any suggestions on good multi-use daypack-type bags? I was thinking something along these lines, but any advice will be great. Any other tips on backpacking with expensive gear? Also, tips on carrying this daypack along with my backpacking pack? Thanks!