I was shown this design for a seed packet this spring by a staff
member at the Cambridge University Botanic Garden (they use it
for their seed collecting). I don't know where they got it from.
Good luck to anyone working it out from the diagram - its easy
once you have got the hang of it!
Start with an A4 (letter, 12 inch, 30cm...) sheet for practice, and
maybe try smaller ones later.