100% LEAKPROOF, GUARANTEED: The Era series is the only 100% leakproof straw tumbler that works for both cold and carbonated beverages, thanks to our patent-pending Ü-Turn technology. So, you can toss your drink in your bag and take it on the go without ever spilling a drop. COLDKEY METAL STRAW: The Era series also has our ColdKey stainless steel straw so you can reduce the amount of plastic sitting in your water all day and experience a cool, crisp drinking experience with a soft-touch silicone tip on the outside to top it off. 24+ HOURS COLD: Thanks to our BevGuard insulation, the Era will keep your favorite drinks ice-cold for 24+ hours. CUP-HOLDER FRIENDLY BASE: The Era has a sleek, tapered design that fits all standard cup holders. LIFETIME WARRANTY: Backed by our lifetime guarantee, the Era will be your favorite drinking companion for the long haul. 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 Ü-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 your drinks cold for 24+ hours, and a cup-holder friendly base so you can enjoy 20oz 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. Recommended for children ages 6+.