I'm 6-6 and was 330 lbs last year and I have to recommend the MoFOCR from cp gear a Canadian company lots of sizing adjustments and it fits nice. Add pouches and a simple water pack on the back and good to go. Buy real once and never look back specially since us big guys don't normaly stop when we hook our gear on stuff. Only thing that takes getting used to is that the rig ends just past the belly button when fitted right so a bit of spillage happens but at least it breaths well. I tossed the link below plus if you plan to lose any wheight it adjusts super easy.
http://www.cpgear.com/store/vest/mod...rig_mofocr.htm