A bottle cage is device used to affix a water bottle to a bicycle. Composed of plastic, aluminum, stainless steel, titanium or carbon fiber. Plastic bottle cages generally are made by rigid PVC which in particular has very high density for a plastic making it extremely hard and generally very strong. It is also readily available and very economical which combined with the long-lasting characteristics of most plastics make it an easy choice for many industrial applications. Some of the most significant properties of Polyvinyl Chloride (PVC) are: 1. Density: PVC is very dense compared to most plastics (specific gravity around 1.4) 2. Economics: PVC is readily available and cheap. 3. Hardness: Rigid PVC is very hard. 4. Strength: Rigid PVC has extremely good tensile strength.