Lauren wrote a review of CamelBak Stoaway Hydration Reservoir on August 22, 2013
Familiarity: I've used it once or twice and have initial impressions
I originally purchased this item for myself to do day hikes in the desert with. It fit somewhat awekardly in my backpack, do the to combination of my pack and the bladder sleeve. I have only used this system twice and liked it. I put quite a bit of ice and cold water in the pack and after 2-3 hours I could tell that it wasn't as cold as I would like but was not as hot as it would have been without the sleeve. My husband on the other had needed to do some walking surveys in the desert and asked to borrow this system, it has been two weeks and I haven't not seen it since. He fills it with ice cubes and then the empty space with cold water. This keeps has been keeping the water cold long enough for him to go through the bladder. He did complain one day that I put too much ice in and that it all froze together making it undrinkable.
I have not tried attaching the system to the outside of my bag as I am afraid the combination of the black color and the desert summer sun will heat the water too quickly. The insulated tube is a little large to bit through my hydration hole in my pack. I do like the cover on the bite valve though. It has been great keeping the sand and dirt off of the mouth piece. The bladder itself has a quick release type tab so that you can detach the tube from the bladder making it easier to refill the bladder.