When traveling on a photo trip, I carry a laptop with at least two External USB Hard Drives. When traveling light (without a laptop) I carry memory cards with two or three times the capacity that I think I will need. On occasion, I have gotten close to running out of space even when packing triple the capacity that I thought I needed. Depending on where you are going, with few exceptions you should be able to purchase additional memory cards at your destination though the price will likely be higher. Good Luck and Enjoy your Nikons!