I was looking for something that would let me forget about my phone and keys during training, and the Deuter Shortrail II does this flawlessly. The biggest plus is the stability – the wide velcro keeps the waist pack in place, so nothing bounces even during faster intervals. The material is light and very breathable, which will be crucial for summer runs. Despite its minimalist look, it easily fits a large smartphone and a water bottle or soft flask. If you value build quality and comfort, this belt is worth every penny.