The Next Generation Mailboxes | USPS
www.usps.com › packagemailboxHolds the majority of mail, so packages get delivered the same time. Mailbox Size & Installation These next generation mailboxes can hold multiple packages, plus your regular letters, cards, and magazines. Dimensions 13.63” wide x 7.75” tall on sides, 12" tall at center x 16.5” deep 2 How to Install This mailbox fits on most standard posts.