Large flat sized USPS Certified Mail Envelope 9″ x 12″ with our ‘Go Green’ security liner. This flat sized envelope holds up to 13 oZ or approximately 64 – 68 pages. The envelope is bright white with the green USPS Certified Mail banner printed on both front and back sides of the envelopes.  This envelope was designed to be used with Certified Mail Labels approved PC Postage and IMB data processing.  Address letters in seconds ’fast and easy’ no more forms or peel and stick green cards. Ships USPS Priority Mail with 2-3 day delivery.

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