Never again
We are normally huge fans of Nuby products, but this particular cup was awful. It was nearly impossible for my son to drink from because you practically have to bite the straw shut to pinch the valve open enough to drink from it. We ended up using the straw that attaches to the valve piece as a reusable straw by itself and use the cup with other styles of Nuby lids.
Jessiekaye
Montpelier, ID