Coconut can be mailed via USPS without a box
facts.usps.comYep.
My nephew did just that a couple years ago.
Just wrote my name and address on it, added postage and sent me a coconut from Hawaii.
It was quite amusing.
Yeah but, "added postage"? How did you stick the postage to the husk? Was it a self-adhesive sticker? Was it printed on, like metered mail? Writing addresses is easy, but it seems like "adding postage" is the trickiest step.