Unless you are doing a type of photography in a familiar situation, I\'d take something that would allow me to review images at night as a greater size and resolution that what you have on the back of a camera. Backpacking situations, I can understand and there I use two cards in the camera each for for the in camera backup already discussed. I do not edit in camera and carry enough batteries and flash cards to last until I get back to civilization. Normally I have 3 copies. One in checked baggage, one in my Think Tank UD-60 with a body, 24-105, and 100-400, 13\" laptop and any other absolutely essential items which is never plane sided checked and a third in my think tank international roll on that does at times get gate checked.
