Give leaks a run for their money with the Rambler Stronghold Lid. Designed for our 20 oz. and 30 oz. Travel Mugs, the lid twists on securely and uses dual-slider magnet technology to help keep leaks and splashes contained. To sip, simply push the magnet down and slide. When youre done, slide it forward. And when its time for a cleaning, just pull the magnets apart and let the dishwasher do the work.