How much to mail just an 8X10 manila envelope with no papers inside?

The cost to mail an empty 8x10 manila envelope within the United States typically falls under the standard letter rate if it meets size and weight requirements. As of my last update, the postage for a standard letter (up to 1 ounce) is around $0.63. If the envelope is heavier or if you're sending it internationally, the cost will vary based on weight and destination. Always check the latest postage rates with the USPS or your chosen carrier for accurate pricing.