Love this pack. I use it for traveling on vacation, as my carry-on, and trekking around.
I read many reviews before purchasing, and the previous comments were very useful, and accurate. The shoulder straps are narrow, as this is a women's model. I find it very comfortable,  and I'm a male, 6'0", 210 lbs.,.
It doesn't slip off my shoulders, like some of the others I own. The contour keeps the pack in place, without securing the breast buckle.
Its also a very roomy pack, with lots of compartments. Water, snacks, headphones, change of clothes, & toothbrush...with room to spare. Never left my side for a week on flight from phl to phx, to Sedona, to the Grand Canyon, and back...!!!
Great companion.