It's 100% bark.. and a few random chips of wood (easy to pick out).
2nd day the bag has been open. The woody smell seems to be going away. I already put 3 mini phals in it. It's less absorbent than I expected (and worried about). It's described as "Hygroscopic" and yet it dries overnight while still fresh.. looks like normal "orchid bark" in that respect.
(50 cents coin is the same size the quarter)
Btw, if I can pick just one pest to have at home, I'm taking fungus gnats
They are surely annoying but mostly harmless.