Take along the Osprey Duro Solo 0. 5L Belt during your quick trail runs when you need to stay hydrated but don't want to be weighed down by a bulky pack. Its lightweight and low-profile design has an angled slot for the included water bottle for easy on-the-go hydration. The main compartment holds your keys, phone, and cash while the stretchy waistband stays comfortable through the miles. Plus, a touchscreen smartphone window allows you to see your times and check texts without having to stop and pull your phone out.