If you wear glasses or sunglasses, you probably have more than a few unused cases lying around. Home-centric weblog Apartment Therapy recommends using them as compact cable storage.
Photo by Taryn Fiol.
One of the reasons cables come untangled so easily is that they're moving around, rubbing against other things in your bag. Sticking them in a glasses case keeps them from getting tangled up with everything else or getting lost in the mess that is your backpack. It isn't as complete a solution as, say, the Grid-It, but if you have an extra case lying around, it's the perfect way to transport your cables.
Avoid Tangles: Use a Sunglasses Case to Store Cords & Cables in Your Bag [Apartment Therapy]