These days it's better just to bring your long term BOB in your trunk with the way the worlds going. If that's not for you though with a 3 to 4 day trip back home on foot your get home bag should still be pretty close. Depending on what happens 3 to 4 days away from home could be a big difference depending on where you live what's there when you return. If you pack it, I say just go with a long term survival BOB outlook.