[Bigdaddy]

I've done a couple of things to combat the 'sag' which is especially prevalent when the binder is not filled with cards/sheets to it's width.

One idea which is not quite so appealing to the eye is to alternate which direction the binder is facing. Put one with the binding on the outside (which most folks do) and the next one with the binding towards the back. That way they stack together like wedges.

The other thing I'll do is put some type of padding or foam in the front of the binder so that the front lays flat when it is laid on its back - the binder is 'full'.

The worst thing for binders is for the binder not to be full and give the pages room to sag or wave.