The Stacker is the most effecient way to carry multiple whitewater kayaks. Features: Fits Thule bars, Yakima bars, and most factory installed racks For a clean look when not in use, The Stacker folds down flat Includes one pair ratcheting tie downs, two straps and buckle protectors 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 Specs: Carrier Type Kayak