I would certainly attach to the quilt the address it is going to. My best friend made a baby quilt for her nephew's baby. She mail it in a USPS Flat envelope. Unfortunately, the only thing that arrived was the label off the envelope. I always use a glue stick and wrap the label with lots of tape (except where the tracking numbers are). I was lucky to have received a USPS flat envelope that had been ripped wide opened. It was sheer luck that it was intact because the seller had placed fabrics in a plastic bag but didn't close it. The fabric was undamaged even in it's tattered state with an apology from the USPS.