We have the same ones, we had the original ones which were blue, purple, and green and leaked horribly. We bought some others and they are a pastel yellow and blue that don't leak as badly. The first set the thing we had to put in the bottom looked like a big coin thing that you really had to press in to make sure it wouldn't leak. These have some raised thing with a hole in the center, don't know how to describe it, but they don't leak as badly