Even if you don't cloth diaper having a wet bag is a must have for mommies. I have mine in my diaper bag and anything dirty or wet goes in to keep everything else in my bag clean and dry. Anything that gets wet, spit up on, drooled on, spilled on goes in the bag. It also comes in handy for the occasional diaper blow out. I have made 3 so far.
I found a great tutorial at A Lemon Squeezy Home. It has easy to follow directions and great step by step pictures. The only thing I have to note is that if you are using a PUL fabric with a print you will want the print to be seen when you open the bag so when you sew on the zipper make sure you have the print side up. In the directions white PUL is used and directions state to have the shiny side up. This is fine for solid PUL fabric.
*JoAnn sells a line of PUL called Babyville for 14.99/print or 12.99/solid a yard. If you have a 50% off coupon you can get a great price. Depending on the size of bag you want you will need about 1/2 yard with plenty left over. Add a zipper and cotton fabric and you can make a bag for less than $10.