Carrying a frame pump and a spare tube or two is smart. But if you're a paranoid android and want to take your preparedness to the next level, then bring one of these -- a tiny package of Park Tool Emergency Tire Boots. Sure, you can cover up a slit in the rubber or in the sidewall with a dollar bill or an empty GU packet, but the Park boot does the job faster, easier, and more securely. Park's boot is made from a waterproof vinyl membrane with fiber weave reinforcement. A pressure sensitive adhesive assures that the boot stays in place in any tire, road or mountain, high or low pressure. A true ride saver.