Use this handy tip to sharpen your knife during your next outdoor adventure by Matt Alpert:
It’s probably happened to you before: You drive out to the trailhead or campsite and realize you left your knife sharpener back at home. Well, if you have your car or truck with you, you also have one of the best knife sharpeners around.
Not the exterior…No, never take a blade to that. I’m talking about the window. If you can roll it down halfway, the frosted glass edge at the top of your vehicle’s window will work as an excellent knife sharpening surface.