Estone Bike Bicycle Cycling Back Seat Double Rack Water Bottle Cage Holder Frame Hanger Water bottle holder, super toughness, will not face a strong impact on the deformation and fracture. Installed in the seat, it can extend installation two water bottle cages, of course Can carry two water bottles, fits for long time riding or Long distance travel. Size:11X9X7cm(approx) 100% brand new and high quality