Bontrager's Speed Concept Draft Box II is perfect for hauling gear or food on your Speed Concept TT bike. With integrated aerodynamics and a secure fit, it's a must-have for triathletes. Proven in the wind tunnel to create zero additional drag, the Draft Box's quick release mount lets you remove it with ease.
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Works great on everything with bottle holder holes! https://goo.gl/photos/LteqdSzeoszmTGmC8 It is HUGE and holds so many items. There is a spring loaded lock that keeps it from just coming off on it's own. After time and if struck or jostled from the side it may break free but I am not willing to try on mine. It looks great and hold everything securely.