Designed to attach to Wolf Tooth's B-RAD Mounting Base, the B-RAD Double Bottle Cage Adapter holds two water bottles side-by-side so we can stay hydrated on longer hauls and trail rides. As a nifty alternative, the B-RAD Double Bottle Cage Adapter can attach one water bottle alongside a Mini Strap and Accessory Mount (sold separately) for greater storage of tools and tubes in remote riding locales.