A Get home bag is usually something you keep in your car or at your place of work. It’s designed to help get you back home if you are stranded somewhere and have to walk.
A Bug out bag is usually designed to help you leave your home or travel to a bug out location. Usually they have supplies for about 3 days.
Finally, an INCH (I’m not coming home) bag is like a Bug out Bag but with more long term survival capabilities. This bag is for if things get really bad and you are not sure if you are ever going back home.