Just started using the Camelbak Rocket which replaced my X-Lab setup hanging off the rear of the seat, a few days ago. What an improvement in bike handling ! I forgot how good the Tuscany really rides. No more shaking on steep descents, I can sit up and take my hands off the drops to stretch out without taking my life in my hands. Bumps in the road don't send me flying off the aero bars. I guess that weight ( X-Lab, spare tubes, C02's and tools) just reverberated the seat post and tube. The problem now is, 72oz is OK for Eagleman's bike leg, but 5:45 hrs on the bike at Lake Placid 72oz just isn't going to cut it. Anyone else out there using a camelbak for ironman races? what's your strategy for repleneshment? I guess I could use aero bottle or carry a bottle on the down tube also. Thanks Ron W.