If you are a photographer, your memory cards are . . . um, kind of important.
While you are shooting, I recommend doing these two things:
1. Carry your memory cards on you (literally) at all times. This is the safest place.
When I am shooting, I carry my memory cards in a Lowepro Memory Card Wallet that attaches to my belt.
If I am not wearing a belt, then I wear a fanny pack and put the memory card wallet in there.
One time while doing an engagement session, I put the memory cards in my pocket (which I have done previous times before). By the end of the shoot, I reached inside my pocket and they were missing! I ran back to the location we were shooting and was so LUCKY to find that they had fallen out and no one had picked them up. Learning lesson: Strap your memory cards on you, tight!
2. Back up your cards as you shoot.
One of my favorite gadgets is the Epson P-6000 Multimedia Storage Viewer.
While shooting, as each memory card fills up with data, back it up to something like this (or a laptop). If you don’t have time then do it as soon as you are done shooting!
Memory cards with data on them are IRREPLACEABLE, so do what you can to take good care of them.