Pinning Front to Back of Backpack

"This is Vicki Walker for Expert Village. For the purpose of our demonstration today we are making the backpack for a little girl and we have assembled the front and the back. The ricrac trim is on there, the casing has been turned down. The D rings has been based on to the side seams. It is where the cord would go through so we would be pinning now with the right side together. The front to the back. I want to be sure that my top edges are going to match so I would start with the top and beginning pinning. Every several inches work just fine and the bottom edges match just like they are suppose to. That should be all the pins that we need to hold out front and our back together until we are ready to sew back to front in the next clip."