Genuine Pure Polaris Snowmobile Switchback Water-Resistant Rear Rack Bag pt# 2878731 Fits Model Year 2012-2014 Switchback, Indy with accessory cargo rack, 550/600/800 Adventure MATERIAL: Compression-molded plastic ATTACHMENT: Mounts using Lock & Ride technology into Aluminum Cargo Rack (required and sold separately, PN 2878721) CAPACITY: Bag measures 10" x 11" x 8", approximately 880 cu. in. ADDITIONAL FEATURES: Zippered closure, zippered expansion panel for increased cargo capacity, grab handle on top for easy carrying to and from sled