What tools do you take with you on a ride? And more importantly - do you know how to use them?
We may have a selection of tools with us on a ride, but they're just extra weight if you don't know how to use them.
If you have a tubeless set up, you should have some plugs with you and know how to use them. Next time your tyres need changing, why not practice fixing holes before fitting the new ones. If you've never used your chainbreaker, you could ask your mechanic for the old one when it's changed so you can practice on it.
What about that pump or CO2 canister? It's worth checking that you know how to use them before you need to. And pumps that are stored on the bike and subject to water, mud and salt should be checked regularly to ensure they still work.