I carry nothing. If I'm cut enough to bleed so much that I can't make it home, I'm calling an ambulance. So far this hasn't happened; I haven't had any cuts longer than about an inch or so, and they don't bleed much after the first couple of minutes. I brush the gravel out of the injury, squirt some water on it and get back on and go. I'll fix it up later.
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Work: the 8 hours that separates bike rides.