The last brevet I did, I stopped to help the _same_ guy by loaning him my pump, twice. He only had CO2. I almost missed the first cut off because of this. I made it by one second. People need to carry pumps, and even patches. You never know when you're going to have a really bad day and run out of CO2 _and_ tubes.
I would have given him my last anything, though- that's how I am.
Nanci