Okay, so my Macbook has finally dispatched I am looking for ways I can charge it, particularly whilst at work or on the move. So these are the possible ways I have narrowed it to, but just wanted clarification and experiences from current users about which methods are the most efficient. 1) USB-C to USB-C cable with USB-C power adapter. 2) USB-C to USB cable with USB power adapter. 3) USB-C to USB cable with USB power pack. Are options 2 and 3 okay to use, or do I require power adapters with a specific voltage?