1. VERSATILE COMPATIBILITY The replacement flip straw lid is specially designed for Stanley IceFlow with a capacity of 30 oz. Note: Not suitable for Stanley Adventure Quencher Travel or Stanley H2.0 FlowState Tumblers. 2. LEAKPROOF LID Our leakproof lid is designed to prevent liquid leakage. Once securely attached, it ensures reliable performance, keeping you safe during use and storage. No more worries about spills or splashes. 3. QUALITY MATERIALS Made from BPA plastic, this foodsafe, odorless, and reusable lid is for daily use with your Stanley IceFlow stainless steel tumbler. Durable and secure, the reusable straw lid is easy to clean and maintain. 4. CONVENIENT FUNCTION The unique 2in1 design lets you sip hot or cold drinks through the flip lid or builtin straw. Open or close it effortlessly with one hand. When closed, it keeps dust out and liquids fresh. The leakproof design ensures worry use anytime, anywhere.