The booklet and the label that came with it are fully in Chinese language. I've used translators and nothing within the text seems to point towards this being truly BPA-free. But so far I'm happy with it. It's sturdy and holds the cool of cold water for a decent amount of time.
Also comes with a plastic filter in case you want to mix your drink with fruits / etc.
Not sure if I trust the BPA-free in the first place, since it’s made in China. Manual is in Chinese and there are quite big Chinese writings on the bottle, to make it obvious where it came from. But I’m overall satisfied with the product