Margaritas, Daiquiris, Mai Tais and more Creating perfectly shaken cocktails at home just got a lot simpler. With easy-to-read measurements on the glass and a cap that doubles as a 1.5 oz, this 18 oz Glass Cocktail Shaker is just what you need for your next party. The leak-proof design allows you to shake cocktails with confidence and the silicone boot on the base prevents slips and spills on the countertop.