Step 1: You need
- some patience
- some sewing ability
- a long zipper
Buying a long zipper might be rather expensive. Or you can be ingenious: I got mine by unsewing it from a plastic clothe cover I bought for 3$.

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I also agree with all these people saying to make something of it. XD This is so simple yet genius, you could.
Opensource diy ftw!
That is all.
made one for my headphones, works great.
I think it is brilliant by the way... 5/5