The shape is designed to fit snugly against the stem to smooth the airflow over the stem, leading into the top tube transition.
ATTK Storage Case Features:
Construction: Injected Nylon/Glass Fiber with EVA foam base
Shape fits snugly against the stem to smooth airflow and improve aerodynamics
Two (2) mounting options; direct bolt-on or Velcro straps
Secure full length flexible slot opening
Size: 210mm x 40mm x 57mm