There are many people with (organization) programs out there, the best thing is to think about what size pieces YOU tend to use most often. If you are often turning to charm square style quilts then 5" squares are good to cut, along with 3" squares ( which will make 5" (4-patches) ... If you are *drawn to* postage stamp quilts, or ones that use 2 1/2" squares then cut your scraps into those sizes. If you lean toward log cabin quilts, string quilts, strip style quilts then save those strips in lengths. In other words, customize your scrap organization to fit you. I keep small plastic totes with lids to neatly stack my cut/organized sizes. Then I have a separate tote I toss the odd ball pieces in, I can dig through it when I need an applique piece or once in a while some new project catches my eye that doesn't fall into my normal cut sizes. When that tote becomes (overflowing) or I haven't used anything from it in 6 months I generally stuff a large ziploc or medium flat rate postal box & offer them to someone who will put them to use.