These are great for those who use different kinds of hydration while running. With multiple slots for small water bottles, you can not only carry your water but also a sports drink or vitamin water. You can keep the weight balanced by keeping the bottles evenly distributed. Many runners like the design of the hydration belt because it helps them ration their water while running better. The belt is lightweight and fits comfortable, but snug, around your hips. It also comes with a few pockets for small storage.