Paxtonwrote a review of Nathan ExoShot Water Bottle - 12oz on October 15, 2017
Familiarity: I've put it through the wringer
The specs say this holds 12 oz, but the most you can fit in it with the sleeve on is 9 oz (I measured). To fill it completely you have to take the handle and sleeve off, which is inconvenient at home and definitely won't happen during a race. It also failed in less than a year of use. There's a hard plastic stiffener in the soft bottle, between two layers of the bottle. The stiffener wore through both layers and the bottle started leaking under the sleeve.
Despite the small volume, it's comfortable and in the summer that I had it I used it all the time. It worked great for short or medium length runs in hot weather, when you want to carry some water but don't need any snacks. I just can't recommend it because it broke so soon.