Professional XTERRA athlete, Will Kelsay, covers what to keep in your bike saddle bag in case you get a flat tire or have a mechanical issue out on the trail.
Tire Levers

Tire levers help take the flat tire off the wheel.
Multi Tool

A multi tools helps with mechanical issues on the bike.
CO2 Cartridge (with inflator)

CO2 cartridges help inflate the new tube quickly and easily.
Spare Tube

Once the old tube is taken out, it can be replaced with the new spare tube.
Saddle Bag

Place all items inside the saddle bag and secure under the bike saddle.
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Will Kelsay is a seasoned veteran on the XTERRA circuit having raced in more than 20 countries around the world over 17 years. Having raced professionally since 2005, he has accumulated more than 50 overall wins and 75 more top five finishes. Over the years, he has been a coach, race announcer, race director, personal trainer, physiology lab technician, videographer, magazine editor and writer, and countless other professions to supplement his racing career.