I think if zombies take over I've got more to worry about than my bike. I started riding to work because of an emergency - the 2001 earthquake in Seattle that shut the city down for a day or two and closed a major roadway for a week (that same roadway will come down soon so this scenario will be repeated in more of a long-term way soon). Bicycling was the only way to get around with any regularity as the buses were all stuck in traffic along with the cars. It was taking cars 1-2 hours to drive a distance that normally takes 15 minutes.

I've got all the tools, extra lubricant, patch kits, etc. Need to get more spare tubes though - good idea! Plus two "extra" bikes. I can carry a lot too. Some people talk about how much of a traffic nightmare it could be, and barring the closure of a bridge, since bikes may be the only way to get around I tell them to get a bike!