MKC x YETI - RAMBLER 20oz Travel Mug The MKC x YETI Rambler 20 OZ Travel Mug is perfect for taking your morning coffee to-go. This double-duty, on-the-go drink handler is topped with the Rambler Stronghold(TM) Lid - a leak-resistant, twist on upgrade that&';s backed with dual-slider magnet technology. STRONGHOLD(TM) LID: The STRONGHOLD(TM) LID easily rotates to fasten for both right-and left-handed users, adding strong layer between your free-flowing drink and the outside world.