Very convenient. Initially, the water does not spill because the straw "closes" as the silicone on the edge has a small opening for the water to pass through. In order for the child to drink, they need to lightly bite the straw to "open" the opening and let the water pass through, but because the straw is quite wide, it comes out spontaneously. Sturdy plastic and wide bottle that is easy to clean. The only disadvantage is that when the straw is closed (folded over the lid), it remains exposed on the top side, not protected in any way.