With 12 Inserts, 2-in-2 Reusable Diapering System, Big Saver, Ideal Gift. We love cloth diapers for their many benefits. But after speaking with many cloth-diapering parents, we realized they were still buying disposable diapers for certain occasions, such as holidays and drop-offs with grandparents. Charlie Banana diapers are a "2-in-1" reusable diaper system. It's a cloth diaper but with a smart front panel that gives you the option of tucking in a disposable pad for those special occasions. With Charlie Banana diapers, you get the best of both diaper worlds. What makes them so special. Charlie Banana One Size or Size diapers are a 2-in-1 system. You can use washable inserts or disposable inserts. It's a diaper with options. We recommend you stuff the inside with reusable inserts. However, we know there are times when you need to be able to use a disposable insert, for instance while traveling or when leaving your child with someone unaccustomed to cloth diapers. Sized versus One Size. Some mothers prefer the Sized Diapers because no adjustments are needed and they always fit perfectly. This is especially true for the size Small diapers. Many babies are very tiny at birth and it can be hard to fit a One Size diaper snugly. To start, we recommend getting a couple of Sized and One Size diapers to see what you like best, and then add more of your favorite styles and colours as you wish. Every baby is different and it is really a personal preference. They are both great diapers.