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Finding an easy way to mail a flat, matted poster is a bit of a problem since there are no standard size envelopes that will hold up in the mail. Here's a simple and elegant solution, and the only cost is for packaging tape and postage.

Here's what you need:
1. Two (2) Priority or Express Mail boxes (15.5" x 21.5")  from your local US post office. These are free.
2. Packaging tape
3. Box cutter
4. Pencil

Step 1: Step One: the Interior Protective Envelope

First, we need to make an interior envelope for the poster to add an extra later of protection and make the whole package harder to damage or bend. We'll take one of the flat boxes and create a tongue flap closure to make a snug envelope.

Start by turning the box so that the short side is towards you.

1. In the lower left of one of the boxes, measure and pencil out a 13.5 x 19.5 inch box.

2. Cut along the 13.5" side, removing and discarding the entire 15.5" x 2" portion.

3. On the 19.5" side, mark out a 7.5" x 2" rectangle in the top right, and another in the bottom right.

4. Cut out those 7.5" x 2" rectangles, leaving a 4.5" x 2" tongue in the center.

Step 2: Step Two: Complete the Tongue Flap

1. Next, insert a cutting mat or an extra piece of cardboard inside the tongue to prevent yourself from cutting all the way through.

2. Cut the top side of the tongue along the 19.5" line. Do not cut all the way through, or you'll just be cutting the whole thing off.

3. Unfold the tongue flap. It will be attached to the bottom side.

4. Next, let's make a slit where the flap will folded over and inserted. Cut out a 1/8" x 4.75" slit about 2.5" inches in from the base of the flap.

5. Place your matted artwork inside the envelope, and close it by inserting the flap.

Step 3: Step Three: Construct the Mailing Envelope

With the interior, protective envelope finished, next we'll make the exterior mailing envelope. This part's really easy.

1. Take the second flat mailing box and find the overlapping 21.5" edge where the ends were glued together. In the Express Mail box below, this edge is where the thick blue line is near the bottom.

2. Insert a cutting mat or extra piece of cardboard inside, and cut along and through that edge on the top side.

3. Unfold the box and turn it inside out so that the blank, brown interior is now on the outside.

4. Place the interior envelope inside.

Step 4: Step Four: Seal It Up!

1. With the interior envelope placed inside, fold the flaps together and tape it completely shut.

2. Using the packaging tape, seal the sides.

Now just address it and put the usual extra warnings on like "FRAGILE" and "DO NOT BEND". You're ready to mail your poster!
I would also add some rigid plastic, to help strengthen the cardboard,<br> along the axes. (I mean plural of axis not of ax{e?}!<br> <sup>I hate the English language at times!</sup><br> <br> Anyways that would help against bending, though lightweight rigid plastic might be hard to come by, unless you collect &quot;random&quot; stuff<br> (like my <a href="https://www.instructables.com/id/My-Workspace-20/" rel="nofollow">workspace</a> does!)<br> <br> On a side note, I wasn't aware that the USPS actually <em>give</em> those boxes for free. Thanks for the info!<br> <sup><em>(Wonder if they would mind me taking a bunch, for &quot;projects&quot;)</em></sup><br> <br>

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