YETI Rambler Bottle Magdock Cap 21071300216 This hydration innovation marries our chug-style cap with the simplicity, function, and power of magnets for a 100% leakproof, on-the-go solution. 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. That`s too many wins to count.