Meet the Ello Oasis Go Tumbler—where modern design meets everyday convenience for life on the move. 100% Leak-Proof Confidence Featuring innovative retracting straw technology, this tumbler can be tossed in your bag without spills. The straw also tucks away to keep the drinking surface clean and protected. Perfect for Hot or Cold Drinks From morning coffee to ice-cold water, the Oasis has you covered. It keeps beverages cold for up to 23 hours, ensuring refreshment that lasts all day.