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. The Travel Mug Stronghold™ Lid has four placement options and plays nice with both righties and lefties. Do not use the Rambler® Travel Mug Stronghold™ Lid with carbonated beverages or for storage of food or perishables. Made with kitchen-grade stainless steel, so they’re puncture- and rust-resistant, and keeps hot drinks hot and cold drinks cold. Dishwasher safe.