Batting tape
The new batting tape that you can use to piece smaller pieces of batting together so they can be used is great. But I have discovered that it is much cheaper to make your own, I purchased lightweight fusible interfacing and cut it into strips and it does the same thing. the packaged kind is like tricot, and you can purchase the very same thing off the bolt at Hancocks or JoAnn's and make your own. It comes in both black and white.