Anything that is within FQ-size goes in my stash.
Anything that is still foldable but smaller than a FQ - like broad strips and rectangles, go in the scrap bin sorted by colors.
Anything that is an off-cut or leftover bits from projects - like HSTs, skinny strips, go in gallon plastic bags sorted by color.
I use the scraps for crumb blocks and applique pieces. The larger pieces work well in strip quilts.