Holding onto a bottle is very important in water bottle cage design and the Arundel Mandible Carbon cage does it extremely well. How can anything so lightweight and seemingly fragile be so strong, you ask? Because the shape of the arms allows for a smaller cross section, but provides 40% more bottle grabbing power than other cages. It's tough enough for any type of use, including mountain biking and cobble-esque road riding. 29 g.