We know that there's a limit to what you can carry, and getting around on foot is not the fastest way to run errands either, while public transport will likely break down in any serious disaster scenario. What means of transport do you expect to use in an emergency? A car is probably the best in terms of carrying capacity (and range of travel), but in the situation of a prolonged disaster fuel will become a problem. I admit I have next to no idea about stockpiling your own gas - is this possible, at reaonable price, and practical? A reasonable alternative, when it comes to short trips, is a bike. Almost everybody uses a bike already, it's possible to prepare a stock of spare parts and tires for each, and if it breaks down, it can usually be repaired manually at home. And there's also lifetime free "fuel supply" Of course, it also means that in terms of travel distance and baggage carried, you're limited by your strength.