I use a 3" x 3" square "Post it" note to make a small envelope to contain the clean, dry seed. Then, I cut a thin piece of cardboard to fit snugly inside a regular #10 letter envelope. Don't use a really thick piece of cardboard. A single sheet of cardboard from a pizza delivery box lid works great. I place the small paper envelope containing the seed on the cardboard and trace around it. Then, using an exacto knife, I cut out the shape that the tracing made. The little envelope of seed will fit perfectly in this "void" in the cardboard. Hold it in place with a little bit of tape. Wrap the whole piece of cardboard, along with the seed envelope taped in place, in a regular 8 1/2" x 11" sheet of printer paper. Slide the whole thing inside an addressed, stamped #10 envelope and mail it in the regular first class letter-mail. The envelope will not be over weight, so no extra postage other than regular first class letter-mail postage is needed. You use the thin piece of cardboard to provide a little bit of thickness to the letter envelope. Othewise, the seed can be crushed in the automatic mail sorting machines. Remember, the seed is held in the void in the cardboard; so, the cardboard, not the seed, takes most of the beating that comes from being sent through the high speed sorting rollers.