The Silca Thermoplastic BC-10 cage is light and durable. The one piece wrap does a good job at holding the bottle securely and will prevent 'bottle launch' on rough terrain. At 25 grams they also rival the low weight of any carbon cage.
One interesting thing to note is: the thermoplastic material used in the cage has a carbon look and feel to it, so it offers a high-end appeal. They look right at home on any top of the line steed. If you are looking for a strong and lightweight cage on a budget, you should consider the BC-10 from Silca.