A good comprehensive bicycle repair kit - unlike many available on ÍøÆغÚÁÏ, this one has ALL the necessary components in one box. Surprisingly hard to find that, I discovered, when some thug stole my last one! I'm amazed at how many cyclists DON'T know how to repair a puncture. Carry spare tubes, sure; but fix the day's punctures at the end of each day. It's easy, you know, and worth doing to save the world's resources instead of just throwing them away and buying new ones each time.