YETI Rambler 20oz Stackable Cup with MagSlider Lid - This versatile vessel pulls its weight around the fire, keeping coffee hot until the last sip and beers cold until the keg is tapped. The cup holder friendly Rambler 20 oz. Stackable Cup comes with the splash-resistant MagSlider Lid to protect your beverage while on the go. Like the entire Rambler Family, it's over engineered to survive extreme adventures and double-wall vacuum insulated so your beer is ice cold or your coffee is hot from the first sip to the last.