Make any hour happy hour by turning your YETI Rambler(R) Drinkware into a cocktail shaker with a leak-resistant shaker lid that's as durable as it is portable. It's made with stainless steel, features double-wall insulation, and No Sweat(TM) Design so your drinks are consistent and cold from the first pour to the last. Compatible with Rambler(R) 10 oz. Lowball, Rambler(R) 10 oz. Stackable Mug, Rambler(R) 16 oz. Stackable Pint, Rambler(R) 24 oz. Mug, Rambler(R) 25 oz. Straw Mug and the Rambler(R) 20 oz. Tumbler. Features: 18/8 stainless-steel design is puncture resistant and rust resistant with double-wall insulation to keep whiskey sours ice-cold Leak-resistant to help prevent spills and splashes Built-in strainer keeps ice back for an easy flow Twist cap makes serving easy BPA-free Dishwasher safe for easy and thorough cleaning