Let's keep it simple: this tumbler doesn't leak. The silicone sipper spout has a built-in valve that stops water from flowing when no one is drinking, so it's easy for children to quench their thirst but won't make a mess if the tumbler is tipped over. The Kelso Dino Camo tumbler is the perfect choice for active kids, or young ones just graduating from sippy cups who aren't ready for an open-topped tumbler yet.
