What makes you think a hydration system with a built-in windscreen wouldnt compromise the aerodynamics of your ride? Wouldnt the added bulk and altered airflow around the windscreen negate any potential benefits of having a hydration system in the first place? And how would you plan to adjust the windscreen to accommodate different riding positions and wind conditions? Furthermore, wouldnt the weight and complexity of such a system offset the convenience of having a hydration system integrated into your bike? Dont you think its more practical to opt for a separate hydration system that can be easily detached and reattached as needed, rather than being locked into a bulky, windscreen-equipped system?