The revolutionary air-free feeding design of our NURSH Silicone Pouch Bottle feature a 100% silicone pouch that collapses as your little one drinks, squeezing out the nasty gas-inducing air that causes colic. No straws, vents or valves here, so it's a snap to clean and assemble. The silicone can even be boiled, sterilized, microwaved, and frozen. Silicone pouches are reusable. Mint Multi 3pk.