When I start a new quilt project (sometimes they can take a while to complete!), I grab one of those zippered bags that you get from purchased drapes, linen, comforters, etc. I save these for just this purpose, as they're clear, some have a "label pocket" & come in all sizes.
I enclose the pattern, notes, & place smaller cut pieces/ blocks in separate zip-lock bags (from snack to gallon size), the backing (if already purchased), binding, specialty threads/ embellishments & anything else belonging to that project.
When I get ready to work on it, or need to take it to a class or travel, it's all together & I don't have to give it another thought! When your project is complete, you can empty the zipper bag & use it for the next one.
One quilter friend also likes to keep a finished quilt's scraps together in a smaller bag w/ a 3x5 card, for the details & later reference (sometimes she makes accessories to match later on).