Maco Cable Organizer
You could master complex cable-wrapping techniques that just use their own wires to hold them together. Or just grab a Maco 2.0 or Big Maco cable organizer. Both slip around your cord to stay put whether attached or not and feature concealed neodymium magnets to tightly lock around cables, keeping them tidily wrapped and compact. The smaller Maco 2.0 is suitable for earbud headphones, charge cables, and the like, while the Big Maco is better for laptop chargers, ethernet cables, and small appliance wires like those on an iron or hair dryer.
Find it at Kickstarter – roughly $11