Quote:
Originally Posted by American Viking
Trunks and true Tail-packs are about the worst bits of luggage, They put a box, up behind the rider, interrupting air flow that is trying to blend back to together. It also puts its weight up high and back behind the rear axle, negatively effecting the handling. Also most trunks and tail packs are still horizontal designs that stick out past the rider's sides, instead of being upright.
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Depending on its size, I think it's a good place to carry a bag.
The low pressure, turbulent, void behind the rider isn't closing up smoothly or quickly at highway speeds, and a bag sitting close to the rider's rear is in that void.
Depending on size and shape it could fill that void in such a way to have some aerodynamic benefit.