[David]

Most everything has been covered: noise cancelling headphones, compression socks, a book or two in case you watch all the decent movies. I bring a fresh shirt, socks, and underwear just to be safe and change the shirt before I land. Of course a full small toiletry set just incase. On my first 14 hour flight, I remember being halfway through the flight and thinking, "wholly crap, I'm only halfway through this fight!"

On compression socks: I bought a few pairs and wore them around as my regular socks before the flight to find which pair works for me and that brand became my go to socks.