“nice, but capacity is limited by shape”

“The attractive feature is the sweat-free back design. The problem is that the spring steel frame element has such a high arch (3+inches)that the pack volume is severely reduced, and the volume shape is a thick curve. Worse, if you put in a single large inflexible object, such as a computer, a book or two, or maybe some chunky outdoor gear, the object effectively blocks use of a large percentage of the space, unless you can cram lots of little things between the curved inner surface of the pack and the object. Do not buy unless you only load stuff that bends, or is so small it does not matter. I thought about taking out the frame, banging away to lower the arch (still leaving an inch of clearance and ventilation room), and reinstalling. Then I thought, forget that, and sent it back. Bought a Kelty Redwing 3100 and it is exactly what I needed. Sweaty backs never killed anyone.”