Super light sunglasses. They weigh in a only 1.1 oz.
I use them for mountain biking more than I do backpacking, and they are really versatile as you can swap the lenses out. When hiking they are in 'shades' mode, when riding they are in 'orange' mode for better visibility in the forest.
What's not to like about a pair of shades that has 20 different lense color choices, including "Multi Laser
Available from Amazon for $115.