It's in the "Just One" family of packs, with additional features - principally additional adjustments for max comfort & versatility:
http://www.eberlestock.com/J107%20Dragonfly.htm
With the "Spike Camp Duffel" zipped into it to add an extra compartment, it's over 7,000 c.i.
May just have to have one - c'mon, bonus!
Here's the overview of the "Just One" family of packs:
http://www.eberlestock.com/Just%20One.htm