BrMate Era 30 oz Tumbler with Handle and Straw 100% Leakproof The Starburst Collection from Cumbria Crystal BrMate Era 30 oz Tumbler with Handle and Straw 100% Leakproof Era 30oz Sage 40 oz Straw Tumbler BrMate Tumbler, Tumbler with. The Star Burst 30oz Era tumbler is designed to prevent spills with its airtight lid, ensuring that your cold drinks stay bubbly and mess free. Thanks to the ColdKey stainless steel straw and BevGuard technology, your ice will remain frozen for a full 24 hours. The base also fits most cup holders, making it the perfect choice for all of 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. Brand: Brumate