From a functionality standpoint, the hanger’s bottles might work well to prevent the pointy shoulders that can be created by traditional hangers. However due to the volume of the empty bottles, it might not be best for those with limited closet space.
If you are in the market for a better eco-solution, you should look into paper hangers. Ditto hangers are made from 100% tree-free recycled paper and can hold up to 20 lbs. For a trendier look, Zilka hangers are a good option, but are not yet available in the US. If you are not happy with those solutions, the New York City-based company Vesta allows you to design your own graphics for their recycled paper hangers.