: Use clear or brown 2-inch wide packaging tape to reinforce all seams. Do not use string or twine, as they can get caught in sorting machines [2].
: Use bubble wrap or crumpled paper. If the box rattles when shaken, add more padding to prevent shifting [2]. Stephjc.zip
If you are preparing a physical item to be "posted" (mailed), follow these professional standards from the USPS : : Use clear or brown 2-inch wide packaging
: If using a simplified address, pieces should be in bundles of 50 where possible [5]. If the box rattles when shaken, add more
: Sacked mail must be labeled by ZIP Code destination (e.g., "5-digit scheme") to ensure correct routing through the NDC or ASF systems [3, 4].
: Place the destination address and your return address clearly on the same side of the package [2]. Mail Sorting Requirements (Business/Bulk)
For large-scale "post" preparation, the USPS Postal Explorer outlines specific bundling rules: