I recently shipped a tubed product to France. There was a "shipping size" regulation (with USPS) that severely limited the amount of protection I could provide for this item. Fedx did not do ground to France. I'm assuming that I could have sent UPS, but did not check. So, keeping that in mind, I may not want to ship anywhere without knowing the
package size requirements. The other thing that bothers me about international USPS shipping is the lack of tracking available and insurance. These are knowns that the other party is usually willing to forgo, as they really do nothing
to get it there. So, I have successfully used the U.S. postal service to ship to Korea, France, and Switzerland.
It makes me nervous until they get it, but other than being a little more work in packing and filling out declaration forms, it has gone fine. They've actually been not too expensive, and fairly quick, too.