I've mailed quilts all over the country and to Canada. I've always bagged them first in a blanket bag then placed in a carton the right size for the quilt. Taped very well. I always send priority mail with insurance and delivery confirmation. I do not put anywhere on the carton that it's a quilt. For international I put fabric on the custom slip. I've never had a problem with this method. About 10 years ago I had someone want me to use UPS instead of mail- they thought it would be a better way. It cost 3 times as much and took 2 1/2 months for the quilts to travel from Michigan to Texas. It was a nightmare! The tracking showed it sitting in Chicago for weeks. No one seemed to be able to figure out why. Never again. Since then I stick with the mail.