Optimal for Long Endurance

The bag is small, but the iPhone and two three gels or bars also fit with pure. But what is most important: After a short while I no longer feel the bag. Jerky in it and does not move noticeably something, even at elevated speeds. The bag itself is sitting around the hip bones bound super tight. I use the iPhone now rather than the sleeve pockets. I think I'll wear them even during the competition!