This double-duty, on-the-go drink handler is topped with the Rambler® Stronghold™ Lid — a leak-resistant, twist-on upgrade that’s backed with dual-slider magnet technology. This lid easily rotates to fasten for both right- and left-handed users, adding a strong layer between your free-flowing drink and the outside world. And if we’re talkin’ about where to take it, its elevated handle lets you enjoy cupholder convenience just about anywhere. Please Note: The Stronghold™ Lid is specially made for the Rambler® 591 ml 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.