BrMate Era 40 oz Tumbler with Handle and Straw 100% Leakproof Amazon.com: BrMate Era 40 oz Tumbler with Handle and Straw 100% Brumate 40oz ERA Blue Agave Ridgway CNC BrMate Era 40 oz Tumbler with Handle and Straw 100% Leakproof. The Era tumbler is completely leakproof, perfect for hassle free sips while on the move. Its fully sealed lid is designed for both cold and carbonated drinks, a ColdKey stainless steel straw helps reduce plastic waste in your water, BevGuard technology keeps ice cold for over 24 hours, and a cup holder friendly base allows you to enjoy 40oz of your preferred beverage without any leaks or spills on your daily adventures. Era Tumblers are 100% leakproof with cold beverages and carbonated beverages with ice when in the locked position. Not recommended for use with hot beverages.