Toddlers and messes go hand in hand, but you can eliminate at least one kind of leak with Munchkin's Click Lock flip straw cups, which come with fun playful designs and a 100% leak-proof guarantee! This innovative cup features a simple locking lid that closes to create a leak-proof seal. You can see, hear and feel the cup lock in place, so you have triple assurance against dribbles and drips. Munchkin even backs this no-leak promise with a 100% replacement guarantee. Secured, and rest assured - this might just be the cup of your dreams.