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So instead of a common tube, I'm carrying sealant, valve cores/tools, syringe? Pass.
Nope, as you don't need any of that stuff. Small holes will be sealed by the sealant, large holes you fix using a tubeless repair kit:
Which looks massive in that picture but is actually very small.
You stop, shove the pointy thing in through the hole, pull the device back out leaving the sticky rubber bung in the hole, then pump the tyre up again and you're on your way.
The sealant? I take the valve core out, use a big syringe barrel and inject it, put the valve core back in, done.