Okay- you ladies have convinced me that I definately want to use PUL on the outside of my contour diapers, thereby making it a form of AIO diaper. What is everyone's opinion on using 1mil or 2 mil PUL? Do you think I need 2 mil or is 1 mil sufficient? The diapers I have made are one size, adapted from prefolds with an added sewn-in insert. The prefolds I used to make the diapers are 8 layers thick in the middle and are commercial grade prefold diapers.