Does not move when you run
I spent quite a bit of time searching the internet for hydration option that would not sit on my hips and bounce when I run. The Race Belt was my solution. The water bottle is a little more difficult to get out of the pouch than a traditional hard bottle in a cup holder on a belt, but there are benefits. The body bottle collapses like a tube of toothpaste as you drink the water, preventing the water from sloshing around inside the bottle. Once I put the pack on it didn't move the entire run. I sweated a little, but he mesh is not heavy and I didn't sweat noticeably under it. The main pack sits in the small of the back. Though I did sweat there, the pack was relatively comfortable. It did not move or bounce, and the Velcro straps were easy to readjust on the fly.
There is a pocket inside the pouch, but I have chosen not to put my phone there as it seems a bit tight in case I needed to remove it while running .
An added improvement would be if they made the lining on the belt reflective. I like to run at night so I have been wrapping reflective material around the belt, but it would be nice if it already functioned that way.