Reddit reviews 8" Hook & Loop Cable Ties - 50 Pieces - Color: Red
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This order is for 50 Pieces of RedLength: 8"; Width: 1/2"Reusable: can be opened and closed thousands of times.More convenient than standard cable tiesMade using polyethylene hooks and nylon loops.
How about this? It's a regular overhand knot, but tied with the rubber band stretched out while it's tied, so that the loop around the thing is small enough that it clings permanently. Just in your case, replace the pen with whatever part of your AC adapter you want, and the hair scrunchie (that I stole from my little sister because they break way less than rubber bands do) with your rubber band.
Here it is removed from the pen so you can see what I mean more clearly.
 
Even better, you can get velcro wraps with little holes in them, like these. Loop it through itself around the cable to get it to hold on, and then just wrap it around the whole of whatever you want and velcro it to itself to hold it all together.