This is a small, lightweight waist pack suitable for running (marathons), etc. It's a product from the American running gear brand, NATHAN. It's convenient for carrying essentials like money, keys, energy gels, and more. It's small and lightweight, so it won't cause any stress while running. ■Brand: NATHAN ■Purchased: Sports store in the US ■Size: See photo 6 I used it only once for a full marathon. I haven't had a chance to use it since, and it's been sitting in storage, so I'd like an active runner to use it.