I was a bit confused by the title. I thought a blow out kit was comprised of tire plugs, and rubber cement.
That being said, I think it prudent to always have pertinent first aid supplies handy. I have been in a couple motorcycle wrecks over the years. Most LEO's are not issued first aid kits. I found that out the hard way, twice. I rely only on myself for protection, and survival. However, I think training is more important than products. You can have the best trauma kit in the world, but it doesn't do you any good if you don't know how to use it efficiently. Likewise a properly trained person can do amazing things with just the knowledge and practical application of their skills.