I've been using a pill box from the pharmacy, a couple of little tupperware type plastic boxes that are 2.95 at CT and one of those little rustproof Orvis boxes that they run on special for $9.95 with a dozen flies. Kind of a translucent orange color. Each of those are boxes built on multiple compartment concept. THey hold flies well, but I don't like trying to dig a fly out of those little compartments. Especially little bitty flies.
The other day I picked up a couple of used CF boxes. I think I am going to like them much better. They have the foam rubber kind of stuff to hook each fly into. I like the way they look anyway, when the little bugs are all lined up, in formation, ready to march into battle.