The Stacker carries up to four kayaks and is the most efficient way to carry multiple whitewater kayaks. The Stacker can be mounted directly on Thule load bars, Yakima round bars and most factory installed cross bar systems, as well as the Thule Xsporter truck rack system. The Stacker fits Thule standard and Xsporter load bars, round bars and most factory-installed cross bars without the need for costly adapters. Four boat maximum capacity; Tying boats down is now easier than ever with the upper bridge design., Easy carrier transfer from vehicle to vehicle with proven universal hardware (included)., For a clean look when not in use, The Stacker folds down flat., The Thule 830 Stacker includes one pair Thule Quick Draw tie-downs, one pair of Thule 15 ft. Heavy Duty Load Straps and Buckle Bumpers., Includes a pair of Thule 855 Quickdraw ratcheting tie down straps for securing the kayak bow and stern., Accommodates kayaks up to 34', Can carry a kayak up to 75lbs, Mount Type: Roof, Watersports Rack Type: Kayak, Model Year: 2019, Product ID: 28302, Shipping Restriction: This item is not available for shipment outside of the United States., Model Number: 830, GTIN: 0091021830172