Simple question: How to tie the power adapter so it doesn't unravel?

Everything's fine with my MacBook - except when I take it outside. More often than not, the long cable unravels in my backpack, becoming twisted mess. The small plastic clip is frequently too weak to hold the cable to the adapter
I'm sure others have had this problem. What's the most secure way to secure the power adapter cord? Any inventive solutions?

I wrap the cord around the power adapter loosely, so as not to put a strain on it where the cord exits the cord exits the adapter, then I put a large, heavy rubber band around the works. It really does a great job.
The rubber band I use is one that is used to secure stalks of broccoli together, in the produce dept. of the grocery store.

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