I have sent far more than 100 quilts, all over including Canada and UK. I always use USPS. Always send priority, with signature required. Some insurance is included but I always add more up to the value. put the quilt in a sealed plastic bag for safety against moisture. Tape the box securely and put an extra mailing slip Inside the plastic bag showing where it is going visibly. Put several labels on the outside of the box to its destination covered against the elements with clear tape and make sure your return address is eligible as well.