I'm looking for a very small knife sharpener to include in my fanny pack. I'd like to be very light, easy to use, and to work on hunting knives, pocket knives, etc.
I'm getting so confused. The little diamond stone one seems nice, but you'd have to hold the right angle and all . . . which could be bad if I had to get my 10yo to do it for me. Saw this one at DiscountCutlery.com

Also, a file would be nice, because I could sharpen saw teeth if I had to.
Or there are these (also at DiscountCutlery):

DH says he wants something for our 10yo to sharpen his pocket knife himself that's easy, Something for me to carry in my fanny pack besides my stone (which is too heavy), Hmmm.
What do you think?