I buy 4 charm packs at a time, unless I'm absolutely in love with the design, and have always had plenty to do a full size quilt. That said, who told you that you couldn't add to your stash? You can never have too much fabric, a very nice lady at Missouri Star Quilt told me that. Charm packs are a good investment as they can be used in so many different ways and in so many different projects. I just purchased 4 of Moda's Contempo which is red and black and is going to be a quilt for my son, there will be leftovers so probably a throw pillow too.