Hone your knife on your vehicle's window? Don’t knock it until you’ve tried it. Depending on the roughness of your window’s edge, it can easily substitute for a ceramic sharpener. While this surface is not agressive enough for a very dull blade, it will hone a good edge enough to make those chores around camp a little bit easier. Of course, the best option is to always bring along a lightweight field sharpener on longer hunting trips. Hopefully, you won't always be next to your vehicle...!