Nightfall Blue 30oz Era Tumbler Lilac Dusk 30oz Era Tumbler Whiskey Skies Amazon.com BrMate Era 30 oz Tumbler with Handle and Straw 100% Mist 30oz Era Tumbler Whiskey Skies Amazon.com BrMate Era 30 oz Tumbler with Handle and Straw 100%. Make every sip on the go hassle free with the Nightfall Blue 30oz Era Tumbler! The unique ColdKey metal straw and leakproof lid allow for easy enjoyment of cold or carbonated drinks. Keep your drink refreshingly cold for over 24 hours with the BevGuard technology and a base that fits seamlessly in your cup holder. Stay hydrated and spill proof during all your daily adventures with this must have tumbler. 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.