If you are preparing a physical item to be "posted" (mailed), follow these professional standards from the USPS :
For large-scale "post" preparation, the USPS Postal Explorer outlines specific bundling rules:
: Briefly explain what is inside the .zip file (e.g., PDF patterns, instruction guides, or source files).
: Use a sturdy box; avoid reusing old mailing boxes as they weaken over time [2].
: If using a simplified address, pieces should be in bundles of 50 where possible [5].