I don't recall hearing the term "get home bag" in this forum, but I may be forgetful. Try changing your search to look for items you think might be unique to such a bag.

I used to take a train from home to work every day. Not having a car - and relying on public transportation - left me feeling kind of vulnerable. My own method for gearing up was founded upon coming up with a list of potential barriers to getting home and then doing my best to address each one in a minimal carry sort of way.