You originally said a couple of folders and the charger for the mac book.
You never mentioned multiple chargers or anything like that before.
Unfortunately since this is so specific the only choice really is a Tumi or custom made case.
I would also like to point out this one: Click Here
has enough room from what you originally stated 1 charger and folder.
It would be able to hold a pad and some pens as well but not multiple chargers and does have a shoulder strap.
It unfortunately does not have a briefcase like handle.
You also originally said you wanted thin unfortunately they most come in standard 3mm for sleeves.
This is the closest thing I can come up with that is not around $400: Click Here
It is 3mm thick, and has an outer pouch which could fit a small notepad, pens, and charger.
Unfortunately it does not have an over the shoulder strap
I would also take a look at this it is a little thicker than you want but has everything else: Click Here
For anything more specific I need the exact details of what you want.
What dimensions exactly?
Exactly what and how many of each will be stored in it?
Price range (this you gave me already).
And what you would be most willing to compromise on if there is nothing within that price range etc.
If you have any questions at all click on reply to expert and let me know.
If not please don’t forget to leave a positive rating for my help - it is greatly appreciated.