Bought a large tray of cut watermelon the other day, and found this weird
thing in the bottom of the plastic container. It looks like a silicone
packet, but has a slick side and a porous side. Printed on it is "Food Safe"
and "Fresh R Pax."

What is this crap, I wondered?

Found this:

http://www.maxwellchase.com/ProdFruitVeg.php

But no word of what is actuall IN these things.

On the good side, the watermelon was still plenty moist, but the bottom
pieces were not saturated and close to spoiling as fast.

The comply with all FDA rules, but who trusts the FDA?