I used to have a stockpile of all lengths to facilitate copying CDs. Oh wait, I didn't just admit to a felony, did I? 46, 50, 54, 60, 64, 70, 74, 80, 90, and 100. Those less than 64 often had thicker binders, but not always. I liked 46 and 50 the most for a while, since they were most likely to...