Now that safety is covered, let’s get down to fixing that busted bike. The most common trailside repair is a flat tire. I carry a plug kit for tubeless tires, but sometimes a plug can’t fix the leak. So I also bring a tube. In a pinch, a 21-inch tube will work on smaller sized wheels, so that’s what I recommend. I like CO2 cartridges to replace the air, and a cheap air gauge to check pressure. Electric pumps are nice to have when you’ve got the room, but with a one backpack goal in mind, smaller is better.