The Granite Portaledge Bottle Cage Mount Strap System provides a lightweight, rock-solid storage solution for your essential items. Made of tough AL6061 alloy plate and a 30 mm silicone-coated hook and loop strap, it weighs just 35g and utilizes standard bottle-bosses to securely store your bike tube, CO2 and tire levers with ease. Give yourself peace of mind when you hit the trails.