Did I mess up my shipping by using ebays recommended postage? I think this usps first class package is more than 3oz : r/USPS
What does first class postage required mean
International Mail Services & Shipping Rates | USPS
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USPS: Send your packages early this holiday season - WRNJ Radio
First-Class Package Service | USPS News Link
![Airmail shipping with USPS First Class Mail [Forwardo]](http://www.forwardo.com/img/fcmi-envs.jpg "Airmail shipping with USPS First Class Mail [Forwardo]")
Airmail shipping with USPS First Class Mail [Forwardo]
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2018 USPS Changes - First Class Mail International / Flat : Customer Support Portal
What Is a First Class Mail Parcel?
Stamps.com - USPS First Class Mail Classification Tool
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Priority Mail Flat Rate® Boxes Variety Pack - VARIETY FRB | USPS.com
First-Class Package International Service | USPS
International Mail Services & Shipping Rates | USPS
Buy First Class Postage Online with Tracking Number
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How to Send an International Package | USPS
Sellers Get Grace Period as USPS First Class Package Ends July 9 - EcommerceBytes
What is USPS First-Class Package service? | Legalzoom
Quick reference | USPS News Link
When to Use First-Class Mail vs. Priority Mail
Can I Use a Different Service for USPS Return Labels? | Shipping School
Mail & Shipping Services | USPS
Priority Mail | USPS
