All In Two Diapers are sometimes call Hybrid Diapers. No matter what you call it, this style of diaper uses the idea of a diaper cover and prefold but makes it much easier! You just snap or lay a soaker or insert inside the outer shell. Instead of having to change the entire diaper, as you do with an All In One or Pocket Diaper, only the soaker has to be replaced and the outer shell can be reused until it becomes soiled. Many of the shells available can also easily be wiped clean on the inside.
Since a soaker or insert is much less expensive than an entire Pocket Diaper or All-In-One, the All In Two Diaper is much cheaper to use. You will be using approximately 2-4 insert per shell. You will also find that the All-In-Two Diaper system takes up less space - when storing them and when washing them!