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 features our ColdKey stainless steel straw, designed to minimize plastic exposure in your drink while delivering a cool, crisp sipping experience. Topped with our SoftSip silicone tip, it’s the perfect blend of sustainability and comfort, making every sip feel like a luxury. 24+ HOURS COLD: Thanks to our BevGuard insulation, the Era will keep your favorite drinks ice-cold for 24+ hours. DISHWASHER SAFE & CUP-HOLDER FRIENDLY: The Era has a sleek, tapered design that fits all standard cup holders. Most bodies are dishwasher safe, and all lids and straws are top-rack dishwasher safe. 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 ice for 24+ hours, and a cup holder friendly base so you can enjoy 40oz 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.