Depends on what you want to do with it, view your images or have something as a simple storage device, some are as expensive as a laptop which is my own prefered method.. Compact flash cards are now 40 pounds for 2 gig so that may be one answer but I guess,  you will need to want to recharge your camera batteries  so months at a time with no electricity is going to be a problem when a solar charger may be a solution..  Are you backpacking or have a car with you on your travels?

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt