- Compatibility: This straw lid fits Hydro Flask Standard Mouth bottles (18 oz, 21 oz, 24 oz), Simple Modern Ascent bottles (12 oz, 17 oz, 20 oz, 24 oz, 32 oz, 64 oz), and most standard sports water bottles, making it a versatile choice for all your hydration needs. - Safe Materials: Constructed from high-quality, BPA-free materials, this straw lid ensures that you and your family can enjoy worry-free hydration without exposure to harmful toxins. - Leakproof Design: The newly designed lid is completely leak-proof, allowing you to store it in your bag or car without concerns about spills or leaks. Stay confident during your travels, workouts, or daily commutes. - Practical Use Scenarios: - On-the-Go Hydration: Perfect for taking to the gym, hiking, or running errands, ensuring you stay hydrated without the risk of messy leaks. - Family Friendly: Ideal for kids' water bottles at school or sports activities, providing an easy-to-use and safe drinking solution. - Workplace Essential: Keep it at your desk for convenient access to hydration throughout the day, without the hassle of spills. Choose this straw lid for a reliable, safe, and practical hydration solution that meets your active lifestyle needs.