Posted by a reviewer on Amazon

Now for the only annoying thing - the spout whistles when i drink from it - it's like a high-pitched little kettle sound - i guess it's caused by the sucking action and the water coming through whatever mechanism - it seems like a small thing but it's really embarrassing when you go to take a drink in company and there's a weird whistling sound that sort of startles everybody.

Posted by a reviewer on Amazon

Sad there aren't more colors.

Posted by a reviewer on Amazon

You just barely push the button and the lid pops open.

Posted by a reviewer on Amazon

It looks shut to keep the mouth piece clean.

Posted by a reviewer on Amazon

I am pretty sure that all components have been fixed correctly and it still produces this weird noise when i drink.

Posted by a reviewer on Amazon

The filter that came with the bottle was incomplete.

Posted by a reviewer on Amazon

It was supposed to have a small rubber stopper on one end, and it did not.

Posted by a reviewer on Amazon

The filter however, just seems pointless.