I use this on the road http://www.rei.com/product/780741/smiths-pocket-pal-knife-sharpener
And this at home http://www.rei.com/product/738633/smiths-3-in-1-sharpening-system .
They both use the same angel so it works great. I glued a piece of an old leather belt to the cover for the diamond hone on the bench top model for a fine edge.