Quite a few years ago, I printed out a tutorial for a tech bag. The creator called it a tech bag because she wanted a bag for her charger cords.
I wish I could find the tutorial for you, but it is an extinct website.
I have, however, finally gotten around to making the bag.
I am going to use it for the same purpose…to hold the phone and the charger cord.
And it is roomy enough to add a wallet and keys, too.