We use cloth diapers (Click here for more info on cloth diapers if you think I'm crazy). For my little family it's all about saving moolah. You could use plastic bags when you're out and about and need to put that wet cloth diaper somewhere, but how much cuter to make a sweet zippered wetbag that can go into the wash with the rest of my diapers AND it matches my grey and yellow diaper bag. I followed this tutorial and I'm so happy with the result (first time to ever sew a zipper too)! Total cost to me: about $4.