Toilet paper cardboard tubes. You'll eventually collect enough, and you can roll the cables into a flat loop, with the two ends on the same side (helps with sor

Toilet paper cardboard tubes. You'll eventually collect enough, and you can roll the cables into a flat loop, with the two ends on the same side (helps with sorting by connectors), then surround them with the cardboard tube. Store them vertically in a drawer or a box (so you see only the connectors).