The CD holder was just a little on the wide side and top CDs would come falling out when attached to my visor so I just sewed a seam on either side of CDs for the first four rows and it works great now!
I love the remnants bin at JoAnn's; I found a piece of vinyl in there for 50% off (so I got it for $1.50 and have tons left over) and made an insert slightly smaller than the bag itself so I can take it out for easy cleaning and avoid staining the fabric. I was nervous about sewing on vinyl but it actually worked out just fine. I use the front pocket for items I want to recycle. You can find this pattern online for free as well as in the book I got for Christmas. Just Google "Not Ugly Car Trash Bag".