I thought these were a really good find. I know some people like to listen to audiobooks or weather radio while hiking, and if you're like me, penetrating earbuds give you the heebie-jeebies.
I personally use headphones a lot while cycling, and getting something that stays in your ear while hiking, running, backpacking, and biking is really tough. I looked for over-ear headphones and stumbled on a great pair.
Enter these devils, from Audiotechnica:

The manufacturer's weight is 20g per earphone without the cord, and the cord is pretty minimal, so I'd put this at under 2oz as a guess. They weigh about the same as a box of tic-tacs. I wish I had a scale. They are about the same size as a silver dollar, I can wear them for hours comfortably when I'm working in coffee shops, the sound quality is very good, and they take up no room in my pocket or pack.
Really pleased, more than I thought I would be for $18.
Here's an Amazon link. They take a loooong time to ship from Japan, but it was worth the wait for me. I got them about 2 weeks after ordering. http://www.amazon.com/gp/product/B001DDLMN2/ref=oh_details_o03_s00_i00?ie=UTF8&psc=1
(I have no affiliation with these guys)

