Applicability of the New Rules. The new cargo securement rules apply to the same types of vehicles and cargo as the old rules, covering all cargo-carrying commercial motor vehicles (as defined in 49 CFR 390.5) operated in interstate commerce.
Most commercially-produced postcards measure approximately 4.21 inches by 5.47 inches. Less commonly, smaller postcards are typically 3.5 inches by 5.5 inches, close to the minimum size the USPS allows.
But, here's an exception: small cards that no more than 4Â¼ inches tall and 6 inches wide and are mailed at First Class Retail or Presorted First Class rates are classified as postcards and get a lower postage price. The exception only applies to First Class prices. For Marketing Mail bulk mail, and other mail classes, postcards are considered to be letters and require the same postage as other pieces in the letters category. Letters that can be sorted on automated equipment get better ...