Cup suggestions

LO does great with a weighted straw, and we tried the munchkin 360 cup tonight... I really don’t see how she’ll be able to get it to work?? We took off the top piece so the white part of the lid was exposed so she could have some water at dinner- there was no water coming out of that thing with the top piece on. I literally tipped it until it was all the way upside down, and nothing came out.

What do you use? Am I missing something with the 360 cup?