This bag for Iphone 5, 5C and 5S a perfect fit, the iPhone 4 and 4S can also store well, with the advantage that the potential breaking point headphone / headset cord moves downward and is thus better protected.
The umklapp tab appears on the other hand, unfortunately, to be a breaking point, here upfront rather quickly cracks at the bending point.
The speakers are hidden by the thick material and due to the lack recesses, also hint vibrations are noticeably attenuated.