This double-duty on-the-go drink handler is the only YETI Drinkware topped with the Rambler StrongHold Lid — a leak-resistant, twist-on upgrade that’s backed with a dual-slider magnet technology. It adds a strong layer between your free-flowing drink and the outside world, come arm swings or speed bumps. Please Note: The StrongHold lid is specially made for the Rambler 20 oz. / 591ml Travel Mug and won’t fit other Rambler Drinkware models. The Travel Mug Stronghold Lid has 4 placement options and plays nice with both righties and lefties, just like all our Rambler Drinkware. CAUTION: Not for use with carbonated beverages and should not be used as storage for food or perishables.