How Many Stamps Do You Put on a 9x12 Envelope?

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The United States Postal Service (USPS) categorizes a 9-inch by 12-inch envelope as a large envelope. But what does this mean in terms of postage? If you need to mail something relatively flat, but also something that doesn’t fit in a standard letter envelope, you may be wondering how many stamps you’ll need to stick onto that outgoing mail. Learn more about how many stamps to put on a 9x12 envelope to ensure its cost is covered — and that it arrives safely.