Leak city!

The concept of these cups are great, but the reality is they leak like crazy! Once the liquid inside starts to warm up, it slowly creeps up the straw and then you’re left with a huge puddle!

These are not bad. However, not right to see a child over the age of five running around with one. They should be able to drink from a regular glass or cup by then

I'm not sure if this so for the munchkin straw sippy cup with the flexi weight on it but here's my review. My son LOVES the darn thing! I can't stand it!! I can't get him to use any other sippy cup! I like the idea that he can drink out of it from any which way but it leaks out of the straw like CRAZY!! There is no vent hole anywhere so everything just comes pouring out the top & drives me nuts.

Now I have emailed the company to complain about the issue & ask if there was anything I was possibly doing wrong with it. Customer service was FANTASTIC! Emailed me back right away asking for details & wanting to fix the problem ASAP. Unfortunately the only solution was to send me a replacement cup (which I'm waiting for) so fingers crossed this one isn't the same.