Things You'll Need
Instructions
Slide your card into a soft plastic sleeve.
Set your card carefully between the two sheets of plastic of the screw-down case and screw them together. The card should not be able move at all inside the case.
Put your card in a padded envelope along with any additional information that may be needed (an invoice or a thank you note), advises Darcy Elliot in the book "The Sports Card Collectors Guide to Trading on the Internet." Fill out the shipping address and return address and place the proper postage on it. Write "do not bend" on the envelope.
Take the card to the post office or drop it off in your mailbox. Purchase a service that allows you to track the package to its recipient.