Debbie Shore has some of the best bag tutorials I've found. She is on YouTube. She has one where the zipper is inserted like you want it. It's called a zippered lines tote bag. Here other bags are great as well. If you go to YouTube and search for her lots will come up. She uses a stripe material for the bag with the zippered top. She left a part out of the video and has a link when you reach that point for the missing part.