It consists of a cover plus insert, making it an AI2/hybrid diaper. The covers are one-size, making it economical. You simply place soiled inserts into the pail and place a clean insert in the cover. Easy. I find the fit excellent on my boys -- the stretch is very forgiving and generous in the upper weight range, and the cover fits both my 22lb boy and my 35lb boy well (with room to grow!)
The cloth insert choices are Stay-Dry or Organic Cotton, and are both one-size -- you fold them to create the correct length (small, medium, or large). There are ALSO disposable inserts, in packs of 18, which make traveling or caregiver situations even easier!
Overall, I really like the Flip system and would suggest it to those looking for a multitude of options. Have you tried the Flip diapers?
