150mm (and smaller) Galaxy S5 Cardboard

EDIT: While this is still a functional headset, I'd highly recommend just picking up a v2 cardboard headset instead. The lenses are bigger and the tech is more fun. Or better yet, grab one of the ones with adjustable focus and pupilary distance. They'll run you like 30 bucks on amazon and they take the experience up a few levels. I'm leaving this up because it's still functional, but I'd recommend grabbing a more recent one. Since I've moved on to a more full featured and comfortable heads