BrMate Era 40 oz Tumbler with Handle and Straw 100% Leakproof Shop Collections Amazon.com: BrMate Era 40 oz Tumbler with Handle and Straw 100% New Brumate Era 40oz Tumbler Blue Agave DWER40BAV (Please Read) eBay Cups GrittyBelleBoutique. 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.