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Frequently Asked Questions
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International Mail Services & Shipping Rates | USPS
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Mail & Shipping Services | USPS
Someone just sent me USPS First-Class Mail labeled up to 15.9 oz, in a Priority Mail box that's actually 4 lbs Bruhhhhh : r/USPS
Mail & Shipping Services | USPS
What is USPS first-class package service? | Legalzoom
Priority Mail Flat Rate® Envelope - EP14F | USPS.com
