Days on the dock are made better with the Rambler™ 30 oz. Tumbler. It’ll keep your dinnertime drink cool well past sundown or your coffee nice and hot throughout the morning. The Rambler 30 oz. Tumbler is made of 18/8 kitchen-grade stainless steel, has double-wall vacuum insulation, and No Sweat™ Design. Which means that you’ve got one heavy-duty, over-engineered cup on your hands with the Rambler Tumbler. It’s dishwasher safe, BPA-free, and ready for just about anything.