The modified Epic carries loads of 80-90 lbs as well or better than any other pack I have used, but that is the upper limit. The reason the Epic works so well for me, is the frame sheet allows the pack to fit my odd shaped back, and the composite stays provide load control.
The Paradox really has no practical upper limit, other than like Kevin said the ability of the person carrying it. It is a pack that will do many things very well.
