Pocket Diapers are very much like AIO but you stuff them yourself.The benefit of this is that you can control the amount of absorbency the diaper has, using more stuffing when needed and less when you can change baby more often making for a less bulky diaper.Also since they come apart they dry much faster.Once you have the diapers stuffed with what you want they then go on easily for Dads and sitters just like the AIO.These do not need a cover because the outer part of the diaper is water proof and they also need to be changed every time the baby soils them.You can expect to have the same number supply as AIO around 12 diapers depending on how often you want to wash them and how old you baby is.