Love this pack, not to big, sized just right. Holds my 17" laptop, or swap it out for a hydration bladder, with room to spare. Large water bottle pockets on the sides hold my 32oz bottles with ease. Mega-pockets all over the inside,in various sizes, one on the exterior is fleece lined for your glasses or phone, which I really dig. Lashing straps on the back are also key, for clamping down whatever extra you may have. I'm pretty picky when it comes to packs, but this one is a winner.