Gossamer Gear Gorilla 40L, 33.6 oz. (2017 Version)
I used this pack on my Mcafee Knob hike, it was comfortable carrying 25+ pounds. Completely breathable and supportive for my back. Grabbing water out of the side pockets is easy.
During preparation for my hike, everything has fit smoothly into the pack. There is plenty of space and plenty of good compartments to separate things. When not using my trekking poles there is plenty of space to put them in the side pocket. My only complaint so far would be the hip pockets are further back on the straps so reaching for them can be a little hard.
I love this pack due to its weight and price. It has some great reviews and is well used on all trails. I intend to do a comprehensive review at the end of my hike.