SMARCO Waist Packs, Running Belt and Fitness Workout Bags for Cell Phone During Outdoor Exercise Large enough to carry your smartphones, keys, cards, cash, wallet, fitness gear, energy bars, passport and power bank along. It is great for all forms of exercise including walking, running, hiking, riding bikes, working out at the gym and more. Water resistant (sweat-proof and rain-proof) keep your valuables dry while you do exercise,not 100% waterproof. Reflective strip keeps you safe at low light condition. Durable adjustable elastic band keeps items staying in place and not bounce up and down during exercise. Fits 29 inch - 45 inch (75cm-115cm) waists with fully adjustable elastic strap.