[maxglute]

There's $100 waterproof bone conduction headphones with built in storage that works great. Speech is pretty trippy and well suited for bone conduction. Only issue is you have to find mp3s of audio, which usually means sailing high seas.

[rimunroe]

There are, but that limits the number of people listening to one, I don't like the feeling of wearing headphones though, and I didn't want to lose sync with podcast/audiobooks either :)