Here's a sophisticated bottle cap ensure the bpa free water bottle can leak and dust proof. Trust it, we test it for tens of thousands. And we support one year warranty. We want you to have the best experience possible. If there is something wrong in our sports water bottle. Or don't like the silicone travel water bottles. Welcome to contact us. And we will replace foldable water bottle or refund. That means you don't ever have to worry about the hassle of returns.