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    5.5 Inch Square Envelopes

    Considerations for using 5.5 inch Square envelopes: 
    • Envelope size is exactly 5 1/2 x 5 1/2 inches.
    • Enclosure size should be 5.25 x 5.25 inches or smaller.
    • There may be an extra charge for mailing square envelopes.  Count the costs by checking out the  USPS mailing regulations.