It all depends on how much photography you will be doing.


I had travel to Europe for three weeks and consumed my memory by end for week 2. Just far more interesting things to take photo of than I first anticipated. In Japan took more memory and still ran out - luckily I was able to pick up more locally for a fair price.


Depending on you budget and how much you typically take photos I would try to bring a few extra memory cards. They are small and easy to transport. Last trip I bought two brand new ones and tried to keep then un-opened so I could easily return them if I did not use them - that worked well as I used them right away when I could not find one of my back up ones (it was still in the card reader back at home - doh!).


I found if I do not have time to process the photos I did not have time to transfer them off the card and onto a hard drive (not to even mention trying to make backups). This also saved me from bringing my laptop along for the trip/vacation. BTW: I only had one memory card fail once, but it still read 97% of the images on it.