Save some space by transforming your Rambler Bottles with our heat-locking two-in-one companion — the Yeti Rambler 5 oz Cup Capp. Not only is it compatible with every Rambler Bottle but it also offers twice the functionality. As an insulated cap it helps keep your coffee tea or even whiskey at the perfect temperature. And when you twist it off you’ve got a double-wall vacuum insulated cup.