Constantly leaks

I love the concept of the weighted straw, it was super helpful when my little one was learning how to use a straw cup and did help with that but unfortunately this cup seems to constantly leak even when on right and after hearing the click, liquids always end up coming out of the straw and all over the place, definitely not spill proof, and it is quite hard to clean out the straw properly but it does come with a hand cleaning brush for that, but after time of using it the straw gets weak at the end where the weighted part goes and starts to tear. Overall I wouldn’t buy again, but look for a different cup with the weighted feature.