I have a Nikon D300 camera so I use compact flash cards. I have CF cards in the following sizes: 8GB, 4GB, & 3 1GB. I keep each card in its individual case until the one in use is full and then I switch them. The problem is twofold. First, it takes time to take a fresh CF card out of its plastic holder and then swap it with the current one. Second, once cards are filled it can be confusing to which ones are still empty. I do try to keep the empty cards in my right pants pocket and the filled cards in my left pocket. Only once have I ever inadvertently formatted a card that full of photos. It hurt to lose these photos and prompted me to seek a better procedure in handling flash cards.
So what do you do? How do you handle your flash cards? Could you please explain the process you use? I’ve been thinking that a case to hold all of my cards could be helpful, but what do you do when handling flash cards?