Blake_ASUSYes sometimes i use a bluetooth mouse, i will pay more attention in order to understand if there is a correllation. Is it possible that the pc remains woke because of it?
I'm not sure....if your laptop successfully enter sleep or hibernate, then putting in to the backpack would not make a difference with not putting in to backpack.
It is true that if your laptop did not go to sleep, putting it into the backpack would easily caused overheating.
So the problem would still be your laptop couldn't go to sleep or being waken up by something else.
Are you connected to any external device? even wireless one or bluetooth?