You don't need an arsenal of gear during those longer runs, but it's nice to have some food and water to keep you going hard. The Salomon Agile 2 Set Hydration Pack stores just enough food and water to give you the quick pick me up you need to finish strong while staying light on your feet. The MotionFit system provides stability and Airvent Agility breathable nylon makes the belt cool and comfortable when you run. The included 1. 5 liter hydration bladder and zippered external pocket keep just the essentials secure, without adding too much bulk or weight to your stride.