if you are getting Digimate, can search for PPCP in Mass Order, they are selling the Digimate III which has external battery. I feel that thats a good way if you want to travel light. But of course, maybe bring along 3gb worth of card rotate around so that in a day, if you dont need, dont have to use the portable harddisk. Do it back at the hotel and after transfer, check it with the hotel's computer to ensure file copy.