I have included some pictures of the inside of the pack as well as the water container. The pack is very easy to use and you can adjust the straps to fit your body comfortably. Since I was using it for the first time on my 9 mile long run, I filled up the water to just 30 fl ounces and then did some test jogs around my kitchen to see how it worked. The pack stayed in place very well and I really didn't notice that I had it on. All I could hear was the water sloshing around in the pack.
For more info, check out the video below where I give a visual demonstration of how to use the pack and go through all the specifics. (I hope the video works - I have never posted one before so let me know if there are problems!)
On the running front, after my 9 miles Saturday my legs were sore, especially the inside of my legs. I took off Sunday and got back out Monday morning for 4.2 miles. This morning (Tuesday) I got in a hill workout before work and may be heading out for a second run as I was invited to join a local running club tonight at their workout!