Optimize your aerodynamics and carry your tools in style! I am selling a rear storage box specifically designed for triathlon or road bike frames with an aerodynamic seat post. It is the perfect solution to eliminate conventional saddlebags that ruin the aesthetics and aerodynamics of your bike. Integrated Design: Fits perfectly behind the seat tube, taking advantage of airflow. Resistant Material: Made of lightweight, durable, and splash-resistant material. Easy Access: Flexible rubber/plastic top lid to quickly take out whatever you need....