In short – No!
We have designed the kit to be as light as possible (the weight of a bag of flour!) and keep the feeling of riding your bike normal.
Jan Heine (Bicycle Quarterly) writes about handlebar-bags, frame geometries and aerodynamics. Handlebar bags that weigh so little (1.5kg) have practically no effect on handling of high performance bikes – and handlebar bags are more beneficial in terms of aerodynamics than any other placement as they produce a forward point to the body.