You know what else is a nice thing to carry? A wad of paper towels to get the grease off. Even if someone can repair their own bike, they often don't have a plan for the grease.
I've handed out paper towels to 4-5 people this year and they were all delighted.
And alcohol wipes. Just the other day someone stopped to give me alcohol wipes after I put my chain back on. The alcohol cleans off the grease completely, unlike paper towels. I'm carrying a pack in my car now.
That’s a good idea.
Less practical: the group I ride with did a 200km ride, with one member having a nice shiny case attached to his bike where the pump might go.
When they finished he smoked his cigar.