The Topeak bag is quite convenient. With several holders which are available individually, the iPhone can be used alternately to a plurality of wheels. Despite the slide the Dsiplay is still easy to read in bright sunlight, there are problems that occur without protection but. The operation is not restricted, while driving but you should anyway leave the finger off the screen. Only criticism: The shell must be rolled up and can obscure the camera, which is sometimes noted only after the recording. Why only 4 stars.