Cut two strips that are the length of your ziploc bag. If your using an exacto knife, make sure you're cutting on a hard surface like a cutting board or cutting mat.
Start to cover one side of your ziploc bag with the strips you cut. To reduce wrinkles, make sure you pull tightly on the strip when you put it on the ziploc bag.
Now that you have one side covered, cut two more strips that are the length of the bag and cover the uncovered side.
Next you're going to cut 2 strips that are the same as the height of your bag. Now grab one strip and put half of it on one side (the height of the bag) and then fold it over so the other half of it sticks the the other side of the bag. Repeat.
Next cut another piece of tape that is the length of the bag. Stick half of that strip to one side of the bag (length of the bag) and then fold it over so that the other half of the strip sticks to the other side of the bag...and you're done! If you want you can check out my instructable on how to make a duct tape bow and then stick the bow onto the change purse.
Thank you for reading! Please leave a comment if you have any questions. Thanks :)