I use Magnus Stingers. I bought the Accusharp, which Magnus recommends, and I can say it works wonders. Works great on my knives too. I have them in the kitchen as well as my pack. Mike Sohm owner of Magnus posts frequently on bowsite.com, and he always recommends the Accusharp. Give it a try, they only cost about $8, and are mostly idiot proof, even I can put a shaving edge back on the blades after practicing.
First post on this forum, looks like it will be fun.
JMAC