The Yeti Rambler MagSlider 20 oz insulated tumbler is the bottle that will get you through the day. Your morning brew stays hot, and your iced coffee will stay cold - so take your time. While the magnet on the included MagSlider lid adds an additional barrier of protection for keeping drinks contained and preventing heat or cold from escaping, note that this magnet component is not leakproof and will not prevent spills.