This is more a comment than a question, but when comparing accessories (specifically Ghost Whales vs Q Kits), I've just noticed the Ghost Whales page doesn't list volumes.
I know volume measurements are approximate at best, but I imagine I'm not the only one who would find that kind of info helpful on the site.
Thanks!
PS -- In the forum here, Cristina's GW-to-OP comparison here is very helpful (though I'm still digging for a Q Kit comparison).