The YETI Rambler 414 ml / 14 oz Mug is the toughest, most over-engineered camp mug out there. Unlike traditional camp mugs, this double-wall vacuum-insulated body protects hands from hot or cold contents while keeping coffee, chili, oatmeal – you name it – well-insulated. The mug’s wide opening means contents are easily accessible, but will cool quicker. That’s why the mug comes with the standard Rambler 887 ml / 30 oz Lid (also compatible with the Rambler 887 ml / 30 oz MagSlider Lid). Important: Do not place mug over external heat source or open flame. Vacuum seal or other damage may occur.