This is review Part 1: Pre-travel. I haven't taken this bag on a trip yet, but I was worried that it wouldn't quite be large enough for my 'always pack too much/ work trip' habits. For those with similar concerns, read on:
I just did a trial pack before my trip, and can report that I have fit the following inside this pack:
digital camera with 105mm zoom lens
big ol' carrying case for over-the-ear noise canceling headphones (8.5"x6.75"x2.5")
inflatable pillow (6"x8"x4")
(all above in the main pocket)
two sizeable phones
portable wifi jetpack thingy.
There is still some room left, but not much. The outside water bottle pockets are quite tight (esp with the bag packed to the brim) but there are hidden snaps that allow for a teensy more expansion. Regular Nalgene bottles will never fit, but maybe a slim bottle.
Overall, I'm impressed. I'll only cram it this full for the airplane rides, but it's still sleek looking and sturdy enough to carry all of that.