Era Leakproof Straw Tumblers Finally, a new Era of straw tumblers has arrived! Our cup holder friendly 40oz straw tumblers aren’t just another dupe. They’re totally leakproof and made for stress-free sips, all day long. Literally the best cup of ever. Stanley has nothing on this. All dishwasher safe. Created design by the fabulous Holley Gabrielle! Limited edition, rare, and impossible to find! Grab it before it’s gone!