Carbon storage system.
It's easy to spot a real-deal weight-weenie. Just look at what's bolted to the top of his downtube. If it's made of carbon fiber, the guy is thinking about weight. The Lezyne Carbon Water Bottle Cage uses FCT structural carbon to shave crucial grams. Lezyne built upper and lower catches into the Carbon Bottle Cage, so your water won't eject mid-race. The integrated low-profile pump bracket is molded directly into the cage body to save weight and space. You can't make your water any lighter, but this is the next best thing.
The Lezyne Carbon Water Bottle Cage is compatible with standard-circumference water bottles and can be used on both small and large frames. It is available in Carbon.