I have a Canon 6D, T1i, and s100. I am planning to take all 3 on an upcoming photo safari in Tanzania. To reduce weight, I'm thinking of just taking cards, although I will have my iPhone and maybe my iPad. (I don't have a laptop and am trying to avoid taking one even if I had one.) Is there an SD card that you would recommend that I could use in all 3 cameras? I know my new 6D will take different cards than the T1i for example, but I was thinking it might be easier to take just one type of card. I know this can be done, but is this a good approach and if so, what SD card would you recommend? If this is not a good approach, please suggest alternatives. I've read some discussion about cards on this forum, but not this exact point. That said, please forgive me if this is repetitive. I'm really looking for guidance here as buying cards with all the variations they have seem more confusing to me than buying a camera. 