Honing a blade in the field.

[JeffG]

Oops, forgot your stone?  Knife is just a litlle dull?  Step over to your vehicle my friend, and bring the side window down about half way....feel that rough edge on the top of the window?  Use that edge like a honing stick, using light but steady pressure, and you can hone your edge.  Later, when you get home, clean off the accumulated metal with Soft Scrub or Barkeeper's friend.

[Anduril]

the bottom of a ceramic coffee mug will work too.
..

[Merle]

While you wouldn't likely have one in the field, my Grandmother used the rim of a stone croc to sharpen knives - pretty much the same thing as a ceramic mug.

I suspect that either of these were the inspiration for todays "croc stick" sharpeners.

 

[RB1235]

Off the glass thing. I have used whiskey bottles to touch up an edge for gutting a deer. I don't know about where you hunt, but I think the old timers idea of hunting was just to drink whiskey away from the wife. There are old bottles everywhere out here in the woods.

[blind ear]

If the bottle seems too slick and is not cutting the metal try putting some wet pasty wood ash on the glass to act as a cutting compound. After the glaze is knocked off the bottle it will work better. If the neck is straight it is easiest to work with. eddie

[Pat/Rick]

I have been carrying a very portable answer for years. Find a ceramic tube that was used years ago for electrical insulators. They were called knob and tube. Sometimes you can find them in old buildings, ASK FIRST!, or even in antique/junk/ second hand stores. A few passes will touch it right up. Easy to make a leather sheath for them out of an old boot top.