This was just racing through my mind and would make sense, only issue would be how many slots you would add for a bag? As a person can currently hold 50 and a car could hold 150 would you say like 85-100 slots including the bag or around that mark? Because if it was to be higher then you would be carrying what a car could carry in my opinion. Just so i can understand a little more and may help the Developers and Staff get a full vision of your suggestion.
Never the less fantastic idea +1 from me
-Katelyn