Print out the instructions, and on the back put another copy of the "part identifier" to aid your recipient.

Shave a little (<1 mm) off the edges of this sheet of paper too, to account for the laser kerf. Fold the sheet in half.

Lay the instructions on top of the top sheet, and I like to use a couple of elastic bands to keep it all in-place. It saves the pieces from all falling out when the package is opened.

Finally, add any message you would like, and put the pack into a card-backed A5 envelope and post it!

All the ones I posted weighed 104 g, combined with the thickness, this puts them in the 250 g bracket for Royal Mail's "Large Letter" - costing £1.26 First Class. If it was 5 grams lighter, it would be 95 p, so YMMV.

At the other end, hopefully your recipient can decipher the instructions to construct themselves a little laser-cut Christmas tree