I think we did okay in terms of tire boot material on hand, but the tire in question was starting to get past the stage where boots help. My overall experience has tended to be that I can ride on a set of tires for a couple thousand miles with only the occasional flat, but once the tires are good and worn out, my risk of getting a flat goes up to the point where I'm better off just swapping on a new tire. And given that I'm not especially good at keeping tabs on my state of tire wear...methinks it might be simplest to just carry a folding tire as a backup.