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This square mailpiece is considered a 'flat' by the USPS. Normally, postage would cost around $ .61- .64 , if less that 1/4" thick, and weighs less than 3.2 oz; but is also subject to a surcharge because it is square, not rectangular. Figure $ .81 If all the above is true.

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13y ago
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Q: How much does it cost to mail a square envelope that is five and a fourth by five and a fourth?
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