Abstract: An improved hanger assembly is provided for use with bottles containing liquids, particularly glass vessels for holding liquids to be administered parenterally. The hanger includes a frangibly-activated hinge that biases the rotation of a hook or loop into a position to enable safe and expeditious hanging of the bottle. The assembly is a substantially rigid unitary construction made of material having a substantially uniform thickness, i.e., not having any elements protruding outside of the general profile of the bottle to be hung. The assembly maintains this profile until the frangibly-activated hinge is broken to allow rotation of the hook or loop into a position to permit hanging. Further, use of a frangibly-activated hinge permits the use of design and materials for the hanger assembly which reduce the risks of tearing the hanger and improve the bottle orientation when it is hung.