I am much more careful to label mine with pieces of paper pinned on that tells me what I am saving it for. My extra fabric for binding that I might need (if binding short) is stored with the binding on the roll or pinned to the quilt top.
I have been lucky to find project boxes at Costco on two occasions. They are 14 X 14 and about 3-4 inches deep. Sold in sets of 5 for $18.99. They hold a whole quilt kit or in process quilts. Easy storage.
Before and for excess, big ziplocks are the way to go. They hold the pattern and all the material. I have way too many.