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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 to 13 inches (33.0 cm).

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[-] Make sure it's working properly. The area that includes the contact details is important..
[-] It should also be in contact with the record's corresponding ziplock or plastic case. When shipping, ensure the label is level and free of brads and suffixes and that any potholder at the edge is not damaged..
[-] Container containers shipped with vinyl discs should always be quarantined from the outside world. Usps regulations require a container with a strong top..
[-] 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..
Answer:
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.