Waist belt bag & hydration backpack the best combo for your exercises. You can store the most important items, comfortably and easily. The waist belt bag has two spaces to store your essential items and a zipper so they don't get lost. Also velcro to adjust to the waist; while the hydration backpack has an area in the front to store any small items you need to put in a save place and the back for your hydration bottle.