I had always been a little fearful of zippers. They just seem so dang hard to put in! I finally found a great way to insert zippers and I started making little zipper pouches. And I love them! But then I had a wonderful customer ask if I could make a tote bag with an inside zipper. Of course I said sure, then I went about learning how. Oh my goodness, it couldn't be easier! It's so much easier than making a zipper pouch. I found the best tutorial here. It's actually a tutorial on how to make hobo bag, which is quite cute in and of itself. But if you scroll down, half way through the instructions she tells you how to add an interior zipper pocket.