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A new Era of straw tumbler is here. Our Era tumbler is totally leakproof and made for stress free sips on the go. It has our fully leakproof -Turn lid that works for both cold and carbonated beverages ColdKey metal straw for minimizing the amount of plastic sitting in your water BevGuard technology to keep ice for 24+ hours and a cup-holder friendly base so you can enjoy 30 oz or 40 oz of your favorite beverage free of leaks and spills throughout your daily journey.Era Tumblers are 100% leakproof with cold beverages and carbonated beverages with ice when in the locked position. Not recommended to be used in the locked position with hot beverages.