I used a Mystery Ranch Swift backpack two weeks ago when summiting Mt. Whitney. Very comfortable and supports a load very well. The construction is well conceived and the feature set is also quite good. Items within the pack are very accessible given the zipper placements and there are ample pockets on the outside. Two outside water bottle pockets hold these items securely, within easy reach, and internal sleeve easily holds three liter bladder. Well placed zippered pockets on the waist belt are of appropriate volume.