Balance (weight distribution) - Binoculars
The weight of binoculars is an extremely important factor as is the distribution of weight, or, in other words, the balance of the binoculars.
Obviously, a heavy pair of binoculars is much more tiring to lug around than a light pair. And at the end of long day, you are bound to feel the difference. However, well-balanced binoculars are considerably 'more comfortable and easier' to handle and are less strenuous on your hands and wrists. This is certainly something worth considering.