I run tubeless road tires, and carry a tire plug kit. Luckily I have only had to use it once, but it worked great. It's about the size of a co2 cannister, and fixed my flat in about a minute, didn't have to mess with the tire at all, just jammed this thing into the hole and reinflated to 100psi. On that day, I was just a few miles into a 50 mile ride, and it held air no problem for the remainder of the ride, I never had to top off the air or anything like that.

Amazon.com: Dynaplug Ultralite Tubeless Tire Repair Tool Kit, Made in USA: Automotive