Review on CamelBak Nano Running Hydration Vest - Running Accessories - 3D Micro Mesh - Adjustable Sternum Straps - Phone Pocket - Storage for Fuel and Gear - 34 Ounce by Michael Nard

Only consider this if you're really looking for a Nano (tiny, actually) version of a hydration vest. A zip pocket barely fits my iPhone6 with a thin case. The fit is snug enough that getting your phone in and out of your pocket isn't as easy as it should be. Maybe you just miss the call. The back has a lot less room to wear than the similar Camelback Ultra Pro Running Hydration Vest for Women (which I also own and prefer, although it's not perfect either). It would be easy to improve the capacity of this vest without adding much weight. But that's JustMe.