Bottle hanger/clamp for hydro-ponics

I created this as an alternative way to hang bottles for a small hydro-ponics setup I am attempting on my balcony. (Based on some of the 3dponics prints) However, the hanger could be used for several other purposes given the simple design.
The clamp is designed to hold a plastic 2-liter bottle such that it does not cause much damage to the bottle.