For a while, I carried an 8x32 monocular with my camera gear as it was pretty light and helped me figure out where to point the camera. As noted above, it's just not as comfortable or as good a view as binocular.
Nowadays, I mostly carry an 8x32 Kowa Genesis binocular (20.8 oz / 590 g) or Leica 8x25 Ultravid BR (8.5oz / 241g) if I really need to watch the weight.
If I were going out on all day excursions with the camera again, I might think of going back to a monocular. If I do, I'd likely ditch the Kenko I have and go with the Leica 8x20, which is an amazingly low 4oz / 112g and quality view, from what I understand. The 8x20 Ultravid BR are a hefty by comparison!