It really depends on when you ask me. The only thing that does remain consistent is that they are separated by type, color, and space permitting, size.

Right now I have terrestrials and midges separated from my other dry flies. The midges are in a very small box that fits in one of my upper vest pockets.

Sometimes I'll pick a small selection of these flies for a certain fishing location, and put them all into one palm sized box.

This could all change, however, the next time I get bored and have a little time on my hands.