Yeti’s Rambler Bottle Cup Cap transforms the Rambler Bottle into a perfectly insulated thermos.  It’s an double-wall vacuum insulated topper that transforms into a cup. No need to bring a cup with you as it's built in. Rambler Bottle Cup Cap Compatible with Rambler Bottles 5 oz cup 100% leakproof when closed and sealed Dishwasher safe 18/8 stainless steel Includes cap only and not Rambler Bottle Final sale