Built like a Tank
This was my first real outdoor activity oriented backpack, I really beat it up and its still going strong. Materials are immensely robust. The suspension system, while it was certainly comfortable for me just starting off, would definitely not be too supportive if, for some reason, you swapped down from an Osprey, Gregory, etc to this Kelty bag. The bag has been in my gear closet for several years as a loaner and it serves very well.
After six years of use (including three summers/fall of everyday use in my outdoor education profession) the bag is still going strong with only a slight loss of material in inside front pockets.