Видео с ютуба Flat Rate Envelope Trick

PART 1. THE ZIP CODE TRICK | HOW TO MAIL THINGS AT THE POST OFFICE | POST OFFICE MAILING ENVELOPES

Tips Trick and Mind-Blowing Hacks for USPS Flat Rate Envelopes- Vlogmas 17

Should USPS Accept This? - Flat Rate Bulletin 22435 Breakdown

Shipping Hacks - Legally Save Money With This USPS Shipping Trick

Easy Ebay Standard Envelope Shipping For Pokémon, Magic the Gathering & Sports Cards