This vent hole on the lid is an intentional design feature—not a flaw. It uses a one-way valve mechanism to prevent a vacuum or pressure imbalance, ensuring the lid opens smoothly and safely every time. Please note: When filled with hot water, temperature differences may cause steam to condense around this vent, forming small droplets. This is a normal physical reaction and not a sign of leakage. This thoughtful detail enhances usability and durability, so you can enjoy your product.

Easy to drink: drink directly from a wide mouth, enjoy the wild fun; rust-free, healthy and worry-free drinking;
Easy to clean: innovative threadless sealed lid, no dirt; Safety and anti-scalding: a free bottle cover can effectively prevent scalding;
Quick lid opening: one-way air pressure balance valve, waterproof and easy to open and close.

A revolutionary bayonet-type cap mount not only enables quick, one-ninth turn mounting and detaching but also significantly reduces metal friction noise, creating a quieter and more pleasant user experience. This is complemented by innovative, water-tight fine venting holes on both the cap and silicone gasket. Together, these features effortlessly balance internal and external pressures, ensuring the cap can be easily opened or secured, even at high altitudes.