Ya can't win! I stopped taking bags from the store because I had such a huge collection. I really like carrying my own. Europeans have been doing it for years. I wonder what their illness rates have been because of that? Never really heard, but maybe it isn't reported. I use the Cheops they sell and I haven't washed them, but I'll re-think that now. I like the idea of making your own and just washing them on a regular basis.