You can store your C9 Christmas lights in a cool, dry place to prevent any damage to the bulbs. It's also recommended to wrap the lights around a piece of cardboard or store them in a storage bin with dividers to keep them from becoming tangled. If you have extra bulbs, you can store them separately in a zip-lock bag to prevent breakage. To prevent dust from accumulating on the lights, you can also cover them with a cloth or sheet.