Our tire's blown, your handlebar busted, your chain broken. But if you think
you're in for a long walk home, think again. There are fixes to almost any
problem you can encounter in the field.
The Problem: Your tire is cut and the tube is trying to sneak through.
The Solution: Welcome to the strange science of booting. Take a power bar wrapper, a dollar bill (they're made of cotton and linen, not paper), the baggy that was holding your sandwich or any other similarly strong substance that can withstand some wetness and wear and tear.
Place the boot material inside the tire over the cut (after making sure that any sharp objects that may have caused the cut are removed).
Then, pump up your tube and ride away. But be sure to replace your tire as soon as possible.
Bonus Repairs
The Problem: Your tube is blown and your patch kit seems to have left town.
The Solution: Mole Skin can be used to patch a tire casing. It has an adhesive backing to keep it in place until you can replace the tire. Mole Skin can hold tire pressures up to 65 PSI. Posted by Larry.
The Problem: Your tube is blown and your pump bit it on that last drop-off.
The Solution: Believe it or not, you can pack your tire with leaves, straw, or grass and limp home that way. Posted by Tim.