I also went to the PO to get a flat rate box. The cost would be $38.00!! So I told a flat rate envelope for $11.00 BUT I can hardly squeeze 2 yds. of fabric in it. Not worth sending 2 yds. for $11.00. Didn't think to check out regular mail (padded envelope) but usually that is more expensive. Can't wait to hear what you all find out.