All you'll need
I just took this on a weekend trip down to Zion National Park to do the Orderville and Subway hikes. It fit everything I needed and I even had room for other peoples ropes and gear. The AirSpeed system is AWESOME and let's your back breathe while you sweat in the summer heat. Hipbelt pockets were big enought for a pair of sunglasses on one side and plenty of Cliffbars on the other side for easy access. Also a shoulder pouch the same size for anything you could think that was small. Started raining half way through the hike so the built-in rain cover was great and we had to do some swimminng so i put a 13 liter dry bag in there as well. Great pack, great weekend!