The perfect maternity bag should function as your handbag, snack bag, milk and baby food cooler and a diapering station all at once. The maternity diaper bag should be roomy enought to fit all possible baby essentials from clothes to diapers, but your own daily essentials as well. Since the maternity bag comes along with you everywhere, it should  look good, be water-proof and easy to clean in case of possible leakages. Choose your favourite style of a diaper bag - whether it's the messenger style travel bag with all those extra pockets and bottle holders, or a more sleek and sporty backpack style maternity bag - the most important is its functionality for daily babycare out and about.