Well, for longer rides, you can always carry a second spare. I have a couple old lightweight Clements (with latex tubes, yet) which work well for just such rides. Sometimes, I will also carry a tubular repair kit, just in case.
When I was younger (and poor), I used to carry a tubular repair kit instead of a spare. Of course, this doesn't work too well if you need to be home by a reasonable time.
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