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How to properly package vinyl records and compact discs for shipping 
Use proper mailers. 
Lps and maxi-singles should always be shipped in a sturdy, cardboard mailer (with cardboard inserts) specifically designed for shipping 12-inch records. The length and width of the mailer should both be between 12 ½ to 13 inches (33.0 cm).
The height or thickness will depend on the number of discs being shipped. When packing an lp, follow these steps : Place at least one 12 " x 12 " cardboard insert into the bottom of the mailer box.