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Priority Mail Flat Rate Padded Envelope 12 1/2" x 9 1/2" – Stamps.com Supplies Store
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Why? I send at least 20 of these a week but this one keeps getting sent back to me.. 02740 to 92009 9x7x0.5” : r/USPS
Frequently Asked Questions
Priority Mail® Forever Prepaid Flat Rate Padded Envelope – PPEP14PE | USPS.com
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First Class Parcels - University Mail Services
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