Don't have many, but the last time, after a couple of flat-free years riding at least three times a week off road, they came in "threes", two for me, one for my wife (fortunately, two were "goat heads" and discovered the next day at home and one was only a half mile from our SUV). Almost never got one when I used sealant, but twice I sliced the tire and it was a mess to repair on the trail since the sealant needed to be cleaned out, the tire booted and tube added. Yes, I carry what's needed. We get far out of civilization on many rides.