Posted by a reviewer on Amazon

Very sturdy not a scratch after all the abuse it has gone throughcleans very well in the dishwasher no mold issues at allno leaking just avoid filling to the brimvery flexible and soft upper straw baby wont get hurt even if he falls with this in his mouth like mine doesnot hard to suck pinch the straw if it is difficult to get liquid out

Posted by a reviewer on Amazon

The sip part is starting to leak though when they are turned upside down

Posted by a reviewer on Amazon

Not a lot but it is supposed to be leak proof

Posted by a reviewer on Amazon

She took to these straight away and they hardly ever leak if theyre pretty full and are laying on their side then they can leak

Posted by a reviewer on Amazon

They are no leak until one of the little flaps at the top bends then they are useless

Posted by a reviewer on Amazon

My only complaint is that i wished that amazon sold the external portion of the straw separately so that when it gets worn out just that part can be replaced they look like they are available through the munchkin site

Posted by a reviewer on Amazon

As it is the whole cup has to be tossed

Posted by a reviewer on Amazon

I recieved these cups a few weeks ago based on the stellar reviews