I've carried and will continue carry a moore maker diamond stone in my pocket as part of my edc. They are descent little stones and I can sharpen a knife fairly quickly with one although they are medium and fine sided stone. Recently picked up a work sharp Guided Field Sharpener and I have to say I'm impressed. They run around the same price is that little moore maker stone but man have they got some cool features. Its more of a backpack,tacklebox or toolbox sharpener but its good nonetheless.

I have been using one of those for years. Under the diamond plates which are held on with magnets are broadbead wrenches, I have sharpened lots of knives, broadheads, and some fish hooks on them

I use the Worksharp that they copied