We developed the Klean Kanteen Tumbler Straw Lid as the perfect accessory for our 16oz or 20oz Insulated Tumblers and Steel Pint Cups and to save the planet from plastic straw waste. Great for smoothies, pressed juice, or iced coffee, the Straw Lid makes sipping safe, easy and spill resistant. Press fit Straw Lid is BPA-free and easy to clean with removable silicone gasket. A great solution to single use straws and easy hydration! NOTE: Straw Lid is NOT leakproof.