Before you mail out that wonky-sized birthday card or lumpy wedding invitation, you should check if it costs more.

For envelopes that are square, bigger than usual, aren’t flat or shaped weird, you’re going to need more than a 78-cent stamp if you want the United States Postal Service to deliver it.

Saturday, USPS issued a new stamp that will be used for these “non-machineable” envelopes, featuring a luna moth with green wings, a white and yellow body and feathery brown antennae, USPS announced on its website.

Such envelopes require special handling and extra postage. The current surcharge rate for non-machineable envelopes is 49 cents, according to USPS. That’s in addition to the 78-cent stamp.

As is the case with a “Forever stamp,” the luna moth stamp will always be valid, regardl

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