Well, I don't know about the mailing of it part, but when I collect it, I make little envelopes out of rice paper (the kind in art supply stores). If moisture is a real concern, I use one of those little packets of sodium silicate to keep things fairly dry. I don't know if sterile conditions are necessarily a requirement, I guess though the introduction of mildews and molds could become an issue, especially in something like a zip lock bag, but I could be wrong.Originally Posted by Piper