NWT Brumate RESA 35oz Straw Tumbler, DUNE The Resa tumbler is totally leakproof. 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 35oz of your favorite beverage, free of leaks and spills throughout your daily journey.