I don't know what happened, I usually comb through reviews for EVERYTHING when it comes to buying things for my kids, but not this time, and THIS is what I get. To be honest, it doesn't leak for me, but it also doesn't work! What do Iean? Well, when my daughter's tried to drink from them nothing came out, I started with a smoothie, and nothing came out, so I thought ok maybe too thick (which is strange for a regular draw like structure to not be able to handle a smoothie) so I tried almond milk,See full review