I gave up backpacking for a few years because I could not find a pack that did not hurt my back. Then I found the Ozone, with its fit system and no back pain! I have used the Ozone three times for a week each time and it has to be the best pack, it carried the load very comfortably (23 to 38lb) my friend carried the Ozone for 30 minuets and purchased one and is very happy also. Back problems or not this is a great pack; I would recommend this pack to anyone. Thanks Granite Gear.