I can ship up to 4 pounds in a flat-rate envelope priority mail ($13.95) to a customer....usually around 4-5 yards, depending on the fabric (USPS). Once you move away from the envelopes, they are scrutinized more for duty. I have several ladies who buy on a regular basis who put in their Order Comments "Use a multiple of envelopes rather than a box". Every once in a while, they get hit with a small duty, but usually they appear to be more of a document package and aren't pulled to check....