To Avoid Wrinkles: Fold the coat neatly and tightly before you pack it in your bag. Wrinkles are caused by either stuffing the coat into the bag or movement of the coat inside of luggage. You can remove wrinkles from your coat with a clothes steamer. If you do not have a clothes steamer you can hang your coat in the shower and let the shower steam relax the wrinkles out of the coat, or you can take a hot, wet wash cloth and sponge the coat.
Step 1: Lay the coat out flat and put the bag next to it to envision its width as you fold the coat. Button the two buttons and lay the raincoat flat with front facing up. Next, fold the coat 4 or 5 times from the edges to the center. Remember the raincoat is still long. Note, the width of the folded raincoat should be a little smaller than the width of the bag.
Step 2: Next, starting at the bottom, make folds that are shorter than the height of the bag and fold up from the bottom to the top - as you fold it the coat will seem to get a little bigger so make sure to account for that.
Step 3: Finally, fold to the top of the coat and simply tuck the coat into the hood and it will fit nicely into the bag. Once you fold it a couple of times, you can pack a coat in about two minutes.