The All In One nappy is a popular choice for care givers on the go. There's no preparation, no folding or stuffing. They are generally pretty easy and quick to put on and can be fastened using poppers or Velcro. The downside is that having the absorbent insert permanently attached to the shell the drying times can be longer than their All In Two sisters. As a result you may need more nappies in your collection if you want solely to use this type of nappy.