This hydration pack is ideal for running, biking, hiking, and other outdoor activities. It's a hydration backpack designed to keep you hydrated during your outdoor adventures. Enjoy your sport while staying refreshed. Features: The water bottle compartment on the shoulder strap can accommodate two 450ML soft water bottles. The energy compartment on the shoulder strap can store salt tablets, energy gels, and other items. The zippered phone compartment can accommodate a 7.0-inch phone. The hydration bladder compartment can accommodate a 1L hydration bladder or lightweight clothing and other items. The backpack Features a reflective design on the front and back, which can reflect strong light in dark environments, enhancing the safety of night running and cycling activities. Specifications: Material: Nylon Color: Yellow/ Black and Red/ Black/ Blue/ Orange (optional) Capacity: 5L Size: 22*6*39cm/ 8.7*2.4*15.4in Weight: 200g/ 7.1oz Package List: 1 * hydration backpack