Brand new, unused, set of 2. The following is quoted from the official website: Aerodynamic Hydration, Redefined Specially designed to further enhance the aerodynamics of your bike when used with the RSL Aero Bottle Cage (sold separately). The RSL Aero Water Bottle is for riders who value speed as much as functionality, and comes with an easy-to-use poppet valve that dispenses contents when squeezed. Product Details 1.8 watts faster on a Madone Gen 8 at 35 km/h compared to a standard round bottle Proven to be faster on other race bikes using our in-house aerodynamic modeling system The RSL Aero Water Bottle & Cage System is UCI-compliant, ensuring safety at all levels of competition USDA-approved, BPA-free, and phthalate-free Bottle and cap are dishwasher safe and recyclable Easy-open, comfortable-to-the-mouth thermoplastic cap Scratch-resistant, long-lasting graphics