I don't keep a lot of scraps. Once I finish a quilt, instead of just dropping leftover bits and pieces into a bin, I cut them up. I make them into pre-cut fabric pieces like you listed. Anything smaller than one of the pre-cut size (jelly roll, charm, layer, etc) gets tossed. Any thing smaller than a fat quarter gets cut down to the next pre-cut size. A fat quarter or larger gets trimmed to straighten all of the edges, and then gets kept in that full piece. It works well for me.
And, every time I finish a quilt, I will make a small zip lock bag of a few of the pieces of fabric I used in that quilt, so if it gets a hole or tear it can be mended. Even if the fabric 'looks' newer when the repair might be made down the line, it is still the same design/fabric and won't be as noticeable as it would be trying to match the color or fabric design with a completely different fabric would be.
I have found that if I keep scraps, not in the pre-cut sizes or the larger, then they just sit until I end up getting tired of storing them and they get tossed. I finally just stopped saving those, as I know I will never use them.
I also label my totes that contain them so they are easily accessible on my shelves.
Last edited by quiltsfor; 01-20-2023 at 05:34 PM.