how 'bout some kind of bag? I do the twisty thing above to hold two cables together, but to store or hold any kind of coiled cable I find the easiest and neatest solution is to put the coil in a bag about the size of the coil. I have lots of coiled cables in ziplocks- sandwich, quart or gallon size. Leave the bag open if your using it to hold a coil while the cable is in use. The bags also make it easy to sort through cables in a storage bag or box and keep everything tangle free.