I have several different models of fly boxes for storing flies. Most all of them the largest boxes that will fit in the large pockets of my old out dated rain jacket. Each box containing one particular style of fly. However, when it's time to fish, only a half dozen of whatever I determine to be appropriate at the time goes into a medium size C&F box with the micro slits, and stuffed inside my waders. The remainder stays in the car or the boat.