So you’ve managed to squash all 7 pairs into a ziploc bag where they have tangled themselves up beyond belief. You’re actually halfway there, they’re all in one place, although not the best way. Here’s what you do to each of them.
Untangle each one while swearing profusely. Pinch the headphone ends in a clothespin, wrap the cord around the pin, pinch the plug in end into the clothespin next to the earbuds.