In reply to j.anstee: the crux harness is nice and comfortable, the straps slip through the buckles a bit when they're new though. I've not used the pod so couldn't compare.
Personally I've finally settled on the macpac pursuit 50 after having a arcteryx nozone and an AK47, its not as light as the crux and the pod although its not heavy either. I find the wraptor harness really nice after testing a friends one out. And the sack is tough.
What ever you buy really look into it, because once you've bought it. It tends to be the little niggles that'll piss you off in the long run.
Good luck