I've found over the years that people often sharpen the entire bevel of their knife when all they rwally need to do is refine the very edge.
I often do this with a ceramic rod.
They can be brittle but the heftier the rod the more resilient it is, so..
I found one that should last a while
Not exactly packable but it certainly helps realign the edge on your knife quickly rather than spend time removing metal that doesn't need removed.