I tried out this gem initially at the Hypnosis Night Run a couple of weeks ago, but wanted to test it out on a self-supported long run before writing up my "official" review. First, I will go over the specs because the hydration pack is structured a lot different than any other hydration pack on the market.
The shoulders have two stretchy pockets that are able to hold nutrition, your phone and any other things that you might need quick access to without taking your pack off. Last night, I had my iPhone 5 and chapstick in the left pocket and three Gu packets and some toilet paper in the right pocket. After the sun came out and I could put my headlamp away, that fit as well in the right pocket with everything else.
There is a larger pocket sandwiched between the bottles and your back where I stuffed my wallet and a couple of Picky Bars (see left.)
The cushioning on the back and shoulders is amazing (see right). It helped absorb a lot of the potential movement and friction and made for an extremely comfortable fit.
For this particular run, since six hours of it was in the dark, I needed to strap a blinky light on the back. This was completely doable and I was also able to strap in a third bottle for additional water thanks to the bungee cord in the middle of the pack (see below.)
Best of all-zero chafing from the hydration pack. I've owned two Nathans and two Camelbaks and always was running into the same problem-severe chafing. To the right, you see a comparison of my chafing from the Vaporshadow and my back right after the thirty miles this morning.
Cleaning is a gazillion times easier, because you can just throw the bottles in the dishwasher instead of having to soak and scrub the bladders with special cleaning kits. Another plus-you can put electrolytes in one bottle and plain water in the other and alternate on your run. Most endurance athletes I've talked to prefer to have both, but bladders like this are in minimal supply and add to the complications of cleaning and maintenance.
In summation, I am THRILLED to finally find a pack that doesn't chafe, allows me to mix up the electrolytes and water, has plenty of storage and is easily cleanable :-) So ecstatic, that I am now an ambassador for the company! Visit the link on my blog to browse their products!