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 Jeremy Sabey

I like it a lot. Build quality/materials feel great and hold enough water for long runs. 3D mesh offers excellent breathability and is very light. It feels like you're wearing a cycling jersey, but you have the option to take it off when you don't need it - it's very easy to put on and take off. It doesn't flap around when you run like a traditional CamelBak or chafe your skin. The feed pockets offer plenty of space for extras such as electrolyte bags, snacks or cash. There is a large storage pocket on the back with enough room for a packable raincoat. If you lead an active lifestyle and are used to wearing tight-fitting clothes, it will not differ from what you are used to. At 5ft 10" and weighing 175lbs I took the medium size and found it to fit great although the front straps need to be stretched as much as possible. The chest straps are horizontally and vertically adjustable for a secure fit. One downside I can think of is that the phone pocket on the front strap cannot be used with medium to large sized phones. I have a Galaxy S8+ and it doesn't fit at all. My Galaxy S6 is stuck, but nothing more is possible. Overall, this is a great addition for light hiking/running/walking. Definitely recommend it!