If you haven't got the Summit Deluxe Backpack Straps- padded ($18.99) you don't know what you are missing.
My climber is only 18lbs. but after a loooooooong walk feels like 48lbs.
The new padded straps are the best upgrade I have bought for my Summit climber.
2nd best upgrade would have to be the side bags.
-a bungee cord! I use that thang from hanging a quiver to my pack or just some extra clothing. I will be getting the pads next year along with the bag.
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"ALWAYS LEAVE THE WOODS WITH SOMETHING"
-Michael T. Webster
"Sometimes the lord calms the storm, other times he calms his child, and lets the storm rage."
As a few of the other guys, I like the climbing stirrups. Great addition! One more thing I'm very fond of is the front storage bag for the Viper. Can't go wrong with a front bag, $14.99!!!