I first saw this product at the ABC Kids Expo and now I've actually seen it in use. And yes, it does in fact work like they say it does. The Mixie formula bottle allows parents to place powdered formula in the tiny compartment, water in the bottle and mix it together with one press of a button when baby is ready to eat. The formula compartment lid actually helps mix it together by acting as a free-floating agitator, mixing the powder around in the bottle to prevent clumping. After you've released and shaken it a bit, you have a perfectly normal bottle. Great for travel, when the right kind of water may not be available. Available in both 8 and 4 oz. sizes. BPA-Phthalates-PVC Free.