I got these for my twins and they work on any of there cups. It’s great to have on the go also. So you know you have a sippy lid with you.

I like the ability to turn a regular cup into a sippy cup. I noticed the lids are a little hard to put on with liquid in them but after some practice it's not too bad. You have to really suck to get the liquid out but my kids and baby didn't seem to have a problem doing it. These cleaned easily in the dishwasher.

I am a huge mason jar fan and this allows me to use the smaller ones as sippy cups. So So adorable.