If it is smaller than a fat quarter and I’ve cut into it for a project the remainder usually goes into the scrap containers. Then, when I decide to spend some time organizing- going through scraps I cut it into the largest piece I can- then work my way down. If it’s a 3-4” width of fabric strip I might cut it into a 2 1/2” strip or what works best. I use strips as narrow as 1 1/2” for quilting, narrower than that goes into my strips bin for twine for hotpads and rugs. Squares I usually cut into 10” on down.