I have a lansky sharpener system at home, been using it for last few months but I need something "portable" for backpack or EDC. I've had an eye on the blademedic knife sharpener from lansky and the "bear grylls" (gerber) sharpener, but to be honest I haven't had luck with gerber. Are either of these any good?
If not, what can you suggest for a simple, portable sharpener for both straight blades and serated?
Can any of them be used for larger blades like my kukri?

Thanks for visiting
Geo