Thanks. I'll have to try the 2 mil sometime. I don't think I've ever seen one that thin. Or have I? The 3-mil polyethylene bags are nice and pliable. I had some that were thinner, and those things are like memory foam: fold it, and stays. But they also tore more easily, if the book corner snagged, for example. I actually prefer the thicker, more pliable bags.
Hunter