Sure have, and they're good for taking on water and gels, but they never seem to have the Infinite that I use, so I travel with some double concentrate to get me through the day. This plan has worked well, and I do start with a couple bottles on the back.

Yes, I'd rather avoid the extra weight for the first hour or so, but let's be real. Those things right behind me aren't slowing me down via drag.

Right, and we all know how important it is to look good during a bike ride, than it is to be properly fueled.

Take a look at the pro's, one bottle or two, why are you carrying so much fluid, the aid stations in races are there to provide fluid and carbs, when i go training on my own, I have a dedicated fuel biddon which only contains gatorade in powder form, so I can mix up more when I find a place to get more water.

Onto a race, and like I said, I use Infinite. I would love to not use the cages at the back, but how else am I going to carry enough nutrition for 5 hrs of bike riding without stopping. Basically, my plan that I've used in the past is a normal concentrate in my aero drink from the start and two double concentrates in my blaze at the back. It stays like this for about an hour until my aerodrink is empty and I will refill with a double concentrate from the back, chuck the bottle at an aid station and start supplementing with water from the aid stations. 3 hrs in, the 2nd double concentrate goes up front and I lose the bottle (now no bottles in the back for drag), and I continue to supplement with water from aid stations.

What happens when you eject a bottle from one of your rear cages during a race?