Yeti Rambler Bottle MagDock Cap. The MagDock Cap is smartly designed with a magnet docking station so you never lose your cap when you're downing your H20. And the customer-favorite narrow spout of our Chug Cap allows for faster drinking while keeping ice cubes at bay. The MagDock Cap is compatible with many Rambler Bottles. Do not use with Rambler Jr. 12 oz. Kids Bottle or Rambler 46 oz. Bottle. Specifications for Yeti Rambler Bottle MagDock Caps: Manufacturer: Yeti Color: Black Size: One Size Features of Yeti Rambler Bottle MagDock Caps 100percent leakproof Magnetic docking station Twist cap Package Contents: Yeti Rambler Bottle MagDock Caps Yeti 21071300216: Rambler Bottle MagDock Cap