It is interesting gear, but I have one question. Have you worn it together with a back pack, and how does it feel? (Uhh.. I guess that's two questions.) It looks like you would have two sets of straps over your shoulders and I suspect that might not work out too well on a fairly long trip.

It is really nice to have frontal access when wearing a pack. You can also achieve that by attaching pouches or bags to the waist strap, although those will ride a bit lower than the Ribz pack.