Every time I am at Lowes, I walk their insulation aisle to see what's new.
I searched the Forums - haven't seen mention of this yet...?
Safe enough to eat - Seriously! No chemicals. If you go to a Lowes (probably Home Depot too), they have cute little samples and a spec sheet. I rubbed it on my hands & face - no problems. Think: "cottony" / fluffy - So, it compresses. Would need to be encapsulated like down. Haven't found water absorption factors yet.
Thermal R-13 -- Can't find the weight; but, sez "EQUAL TO regular fiberglass.
Price: A compressed "bundle" (like home fiberglass insulation) is $52 - Comes "loose" or faced with paper.
If you dig around on the above website, you'll find spec sheets, comparisons, etc.