Check the listing for details. Bicycle Water Bottle Holder Adjustment Right Load Bottle Cage Purple. Color: Black, Condition: New. Listed at 16.61 USD. 1. A bicycle bottle cage is a bracket or base mounted on a bicycle frame that allows riders to easily carry and access a water bottle while riding2. Crafted from a high-strength blend of polycarbonate and fiberglass, this bottle cage weighs only 1.38 oz, delivering an good balance of lightweight performance and durability. The advanced composite construction offers superior strength compared to traditional plastic cages, while remaining significantly lighter than aluminum options. Its optimized design reduces overall bike weight and enhances riding efficiency, making it suitable for performance-focused cyclist.3. Equipped with screws, it will not wear out the bicycle frame and is easy to install, ensuring that the bottle cage firmly grasps the water bottle to prevent it from falling during a bumpy journey.4.