I think it depends on the flat, the fold and how heavy of a wetter you have. I like the oragami or Jo fold and if I need more absorbency I just tuck a small booster in. We only use flats at home though so no need to add anything usually.
Engaged to the love of my life and mama to our sweet little Kai bear born 2/12/2010 and our new little princess Savannah born 3/16/2012
baby wearing, cloth diapering, EBF, semi crunchy mama origionally from BC now a resident of good ol' AB