If you remember anything about knife sharpening, let it be this: A harder surface can sharpen a softer surface. Find a material harder than your knife, and it's possible to hone an edge.
As this video points out, common materials can be used for knife sharpening in a pinch. Car windows, rocks, other knives and more are demonstrated. One not included, but cited often for alternative sharpeners, is the bottom of a ceramic coffee mug.
Learn more about the science behind sharpening in this knife maintenance download from BLADE, a sister publication.
And if you prefer more modern sharpening systems, Gun Digest recommends this 5-Stone GATCO kit.
Outstanding Gear and Resources
Special Forces Survival Guide
Survival Straps Survival Bracelet
SAS Survival Handbook
Why You Can Trust Gun Digest
Since 1944, Gun Digest has been a trusted authority on firearms, shooting and shooting gear, delivering expert firearms reviews backed by nearly a century of experience. We go beyond standard reviews, combining hands-on independent gun testing, in-depth research, and expert insights from industry professionals and manufacturers.
Our reviewers are the bedrock of our testing and come from a comprehensive cross section of the shooting world. Their diverse backgrounds include law enforcement professionals, military veterans, competitive shooters, seasoned hunters and life-long firearms enthusiasts. In addition to being firearm experts, we are also thorough journalists adhering to the strictest standards of the profession.
For our readers, this means objective, unbiased reviews, free from outside influence. Our priority is to provide the information you need to make informed decisions—whether a firearm or piece of gear is a must-have investment or one to pass on.
Find out more about our Editorial Standards and Evaluation Process
