I've shipped quilts via UPS as well as the USPS, with tracking and insurance. I always put the quilt in a white plastic kitchen trash bag, they usually are large enough, or if I have one available, I will use the vacuum seal bags, which can compress the quilt. I'm about to ship a quilt top to my niece in KS so that she can quilt it for our family reunion July 4th weekend. She has a long arm quilting machine and I would never refuse the offer of her quilting it for me, as she told me that I cannot retire from making the bi-annual family reunion quilt that gets raffled off, but she at least offered to quilt them for me. It's a God send for me as I'm having shoulder surgery next month and I'm doing good to get it done in time to send it to her so she has time to quilt it. When I made the first reunion quilt umpteen years ago, I never dreamed it would be such a big hit at the reunions, so they have become my legacy.