The post office charges extra for square envelopes, and for envelopes where the stamp and address make it clear that it’s to be held and read portrait-style, with an alignment that is taller than it is wide. Your envelope must be a rectangle with a landscape alignment.That’s quite thick! But if you plan to include lots of filler inside your envelope, consider how the material you use for your envelope will also affect its thickness. That’s the thickness of an index card, so it shouldn’t be hard to achieve. But better to be safe than pay extra postage, I suppose. That is apparently the weight of four pieces of paper! I sometimes send a whopper of a letter to a friend, so I’m positive that I have violated this weight rule numerous times with no consequences. The entire letter, contents and all, cannot weigh more than 1 ounce, says the post office. Allowed Shapes and Sizes for EnvelopesĪs long as you play by the USPS’s rules for the size, shape, and weight of your letter, you can have a little bit of fun with your envelopes. You CAN mail handmade envelopes through the US postal system without paying extra, and you CAN even be a “little” creative with them! Here are the USPS’s current regulations for envelopes, and ways that you can work with them while still sending handmade. I’ve been upcharged for putting handmade pinbacks or other fun treats in my envelopes so that they’re uneven. I’ve been upcharged for making my envelope out of super stiff upcycled cardboard. I’ve been upcharged for mailing an envelope with the address written in portrait rather than landscape format. I’ve been upcharged for mailing a square envelope. I’m fairly sure that I have made every mistake that it’s possible to make while trying to mail my handmade envelopes through the US postal system.

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Mailing letter envelope