I just carry a can of fix-a-flat with me. I haven't had any problems with my tires, but I'm sure the fix-a-flat can get me to wherever I need to go. I know you can get a small spare and a little handy pouch to carry it in if you are really a worry-wart. Someone on the forums makes the pouches. Maybe someone knows who they are or has the link to a post.
Angus
Angus