I've never had any problems shipping packages to other countries and the people I send them to haven't told me of any problems they have encountered. I send ALL the things in Flat Rate Boxes. I always check GIFT on the Customs Label, and I put down that what's inside is Fabric, then put a price of $50 for the entire thing.
I've shipped to Spain, Australia, Hong Kong, Japan, Canada, England, Thailand and Singapore. No one I have sent to has had a problem, that I know of. I send straight thru the Post Office.