So I ordered a duplex as I think it will be more versitile for switching from hauler/dayhunting/high country hunts. I had a T2 and as luck would have it I was delivering it today (sold it to buy the duplex) and the duplex arrived just a couple hours before I left. So I got weight in both of them and walked about. The first thing I noticed was the duplex comes up much higher from around the head. It seemed to handle the weight minorly better but I imagine the advantage grows as the weight gets heavier, I had about 40 lbs sandbag I was using. But I am having a little sellers remorse as I like how your head has so much more room compared to the duplex. I will probably end up cutting the handle strap on the duplex just to give my head more room. Just thought it was interesting I never figured that there would be such a big differense between the duplex and timberline packs.