Fits with Hydro Flask, Nalgene, and various wide-mouth bottles Robust material with rubber lining Not entirely leak-proof Dishwasher safe Free from BPA and toxins The Adventure Lid is perfect for staying hydrated on the go. Its wide mouth features a flip-top for easy access, and a handle for secure carrying. It's an instant fit for wide mouth Hydro Flask and NuRich bottles. Enjoy hot drinks on the move; the lid has a flip-top with a rubber plug to prevent spills. Note that it's not leakproof.