I created a travelling case for a Mac-Book Charger and the cable.
The Top can be twisted in place, to secure it for long travels and the Charger is being held in place, so it can't move. The cable is wrapped around it inside wall of the case, so it doesn't need to make any hard bends.
The case itself is design to be as small as possible, considering the brick on the inside.
It is very straight forward and easy to print, and just minimal support is needed.
The walls are thick enough to endure a fairly long time in a bag, but thin enough to be easy on your filament.
I hope you like it and if you should have any suggestions for improvements, just comment