1. Water Bottle Holder Design: Water bottle not included. The water bottle holder includes an adjustable elastic cord to keep the water bottle stable and secure while running or jogging, preventing bounces and falls. 2. Reflective Design: The mountaineering bottle cage adds reflective strips to the sides of the multifunctional pockets and buckles. The design will reflect clearly in light. Provides you with greater safety when running at night. 3. ADJUSTABLE AND PERSONALIZED FIT: Fits the waist with fully adjustable back straps. Soft, breathable back mesh padding fits around your waist. 4. MULTIPLE POCKETS: There is a zippered main pocket for your phone, and the front pocket is designed to store keys, credit cards, keys, tissues, energy bars to avoid scratches on your phone screen, and a headphone jack for listening to music while running.