I don't know what thickness I use, because my local hardware has only one thickness. It is about the thickness of a regular store bought quilting ruler. I cover it with a fabric sleeve that comes off. When the diaper bag is washed the template comes out. The sleeve can be washed with the purse/diaper bag, and the plexiglass can be washed with any windex type cleaner (or anything else, for that matter). Then the sleeve is put back on and your good to go. I came up with this idea because I always have spills in my purse...
Clear as mud? :roll: