Yeti 20oz Rambler Tumbler with Magslider Lid With the rambler 20 oz. Tumbler, your beverages will stay ice cold or piping hot longer. We over engineered these double wall insulated tumblers with an 18/8 stainless steel body, which means your drink still keeps its temperature no matter how much of a beating this cup takes. Great clean preowned condition, one marking on the cup as pictured.