Ian C.wrote a review of CamelBak M.U.L.E. NV Hydration Pack - 854cu in on June 27, 2012
This is by far my favorite small pack that camelbak offers. It is large enough that if you want to you can use it for a day trip (although its really tight and its hard to fit a jacket in it along with other supplies and food).
I own 6 camelbaks and I use this one the most because it is good for almost anything besides a big day trip or anything longer than a day. This is the second one of these that I have bought, I gave the first to my best friend after buying this years version of it.
I love the organization pockets and exterior pockets and the rain jacket is awesome. The built in rain jacket is such a plus because you can get away with not having a rain jacket on warm summer days (the important electronics and supplies will be kept dry inside your bag).
Not all M.U.L.E.s have a built in rain jacket. Only the M.U.L.E. NV has one, not the standard version.