thought I'd report back on my purchase of the Fluid 6. first mine came under spec at 9.5 oz :)
there are several small front pockets on the vest portion, one is zippered and just the right size to stow a couple dozen electrolyte pills
it doesn't come w/ a bladder, but has a sleeve and velcro loop to hang one- been using a 2.0 liter Platy Hoser w/ mine
I've had on two long runs, one 19 the other 20.5, the pack carries very nicely- there is no bouncing or jiggling, should have moved to a vest style pack earlier :)
a couple of small nit pics- would be nice to have a small mesh pocket in the main pack to separate things like TP, FAK, headlamp etc- they easily do this for less than a 1/2 oz; would be nice to have one slightly larger front pocket on the vest portion- something that would hold a camera or the like
the pack definitely would do a long day adventure- including a light insulating layer and a days worth of food, appears to be a keeper!

