This is a Quick Release Freeride Tunnel pak - this is a solution to keeping your gear dry and secure. This pak is approx. 14" wide X 18" long X 8" tall, and offers 2,000 cu inches of waterproof storage. Mounting system designed to fit a Polaris Pro and AXYS chassis tunnel, requires a Skinz T Slot adapter kit to fit a Matryx chassis tunnel.