A Bug out Bag can also be used as a Bug in Bag. Mine is there to keep all the gear in one place so I can find it when bugging in. Like last week when power went out after a storm I got the lights out of the BOB and the scanner to see what is going on around us.
I've started replacing battery powered gear to standardize on one type (AA) instead of the multiple like your AAA,AA,123. By eliminating one or more types I was able to save room for more of the others and even carry a small charger with vehicle plug (MAHA C401FS).
I'd add a flash drive with important documents or backup cd's or even a hard drive in an external enclosure that stays there just in case you can't get to the laptop in time to pack it. My laptop stays in the living room and my BOB is in the bedroom so if I had to leave via window my backups are there already.
A new change I have made is keeping the front pocket of my BOB empty and when I come home and empty my EDC from my pockets into that pocket. That way if I bug out in the middle of the night I don't have to try stuffing my pockets full of my edc gear, its in the bob and I can transfer it later.