You could probably get by with one kidney, as well. That would be a great way to drop weight for the next sick project. V2 here I come!
It might be more useful than you think. If you think you don't need it, maybe you can hollow it out and use it as a "front" chalk bag...maybe put a brush in there, or some bus fare...If it's a weight issue, just punch holes in it
I've climbed with a guy who carries 20 draws, most of them four footers, up every pitch. And in addition to his large set of cams, he also carries four OP Link Cams. Those thing are like 5 pounds each!
And he's no noob, either, he climbs a ton!
As for me, only thing I can think of is: I carry more nuts than I usually need (doubles on the small end). But hey, they're light.