1. Safe and breathable - The reflective strips on the bag can effectively let the vehicle see in the dark, which is a good safety design for night running; the back mesh pad is breathable, keeping the waist dry and fresh when exercising.2. Headphone jack design - The unique headphone jack design allows you to enjoy the company of music during exercise and say goodbye to the silence of sports.3. Stable Water Bottle Holder - There is an elastic cord on the mouth of the water bottle holder, which can effectively keep your water bottle stable and safe while running or jogging.4. Adjustable High Elastic Waistband - Hipbelt with quick release buckle that shrinks down to the smallest size you need, one size fits best. Fully adjustable shoulder straps, uniquely designed shoulder straps relieve lumbar pressure.5. Hands-free and Lightweight - Free your hands and enjoy pure freedom, suitable for camping, biking, beach, concerts, rave, barbecue, festival, travel and other outdoor activities.