I wanted to find something that would allow me to train without having to carry my phone and keys in my hands, and the Deuter Shortrail II works perfectly for this. What I appreciate most is its stability – the wide velcro strap means the waist pack doesn't move around while running, even at a fast pace. The material is very light and breathable, which I'll value especially in the summer. Despite its simple design, it easily fits a large phone and a water bottle or soft flask. If quality and comfort are your priorities, this belt is definitely worth its price.