I'm a pretty into EDC, but am not a complete nutjob like some people. I just purchased a larger power bank for traveling, and instantly realized I would lose all these cables immediately. I have scoured the internet and surprisingly found no solution that would fit my specific needs. So, some googling and some brainstorming led to this great idea!
This is solution is cheap, resourceful, and grandpa approved! I bet your grandpa made a slingshot back in the day with a similar method. The following images are simple walk through of what I did with few pictures off my iPhone7+ and a brief descriptions.
Storage needs, mine are a phone charger cable and two micro USB cables.
These DIY "ranger bands" have a myriad of uses. The most popular examples range from the classic Altoids can of essentials, to accessorizing your AR15. For this application it adds grip, isn't obnoxious looking, and allows you to strap your phone to the other sides while charging. If you're a nerd like me (and know what a Grid-It is) then I'm sure you'll find your own function uses for these as well. Enjoy!