This top tube mounted pack mounts behind the stem and tapers to the top tube to help smooth airflow. Large capacity recommended for longer multi-sport events. Installs using direct mount top tube bosses on compatible bikes or three bottom Velcro straps and two front elastic straps to optimize positioning. Zippered top closure keeps items secure. - Bolt-on compatible TT/Tri bikes - Improved shape to integrate with stem steerer tube clamp - Size: 240mm (378cm3) - Weight: 60g