I choose to use flat rate priority mail, because your package will get to its destination quicker and is fully insured in case it gets damaged in the mail. Lastly, it is usually the cheapest way to ship.

Artwork is sent in a ridged flat rate envelope. Prints are put in a plastic sleeve to protect from water. Then they are put between cardboard or tag board to prevent bending.

Prints larger than 12 1/2 x 9 1/2 inches are sent in poster tubes.