Hmm, interesting. I need to reorganise a little bit. At the moment, I have them arranged according to generation and in a baggy. My G1's for example are cut out and in a resealable bag, but it isn't sealed.

The tin idea I like though. If they have cards, I have them grouped and put into the plastic bags that hole the instructions.

Now though I have a tendency to keep the backing cards as well. Especially with Animated as they didnt have tech specs cards, but the bio and special powers on the backing card. So big and so many. Not too sure what to do with them.