I have tried them all andthe Wolf Pack System that I found atthe annual hunting showis by far the best pack on the market. I have the full size with all attachments and it has not failed on me in over 4 years of heavy long range backpacking/hunting. I even strap on more cylinder shape water proof packs to haul more than this pack was designed for. They make smaller packs for shorter trips. The material they use is very strong and so are the zippers. I have maxed this pack out to over 120 pounds and it has not torn or ripped yet. 3 hernia surgeries later, this pack is still as good as new. The only down fall is it's empty weight isabout 20-30% heavier than the less expensive gear you will find at local stores. The extra weight is due to the quality of material and duribility of the pack.

http://www.wolfpacksystems.com/

Check it out and tell me what you think.