I know the original question was about carrying both a traditional and modern knife, which I rarely do, as I noted in my previous response. Looking back over the various responses got me thinking about the different approaches a traditional and a modern implement take to basically the same task.
The blades on my modern Kershaw Leek and my quite old Camillus equal end do the same thing, they cut.
The packaging and materials are certainly different, and the way the blades are deployed is different. But when it comes right down to it, they are both cutting implements, and they both perform that task admirably.
This is not unlike my 1927 Sheaffer Flat Top and my recent production Visconti Skeleton fountain pens. Different design approach, different materials and packaging, different method for holding ink and getting it from the bottle into the pen. But when it comes right down to it, they are both writing implements, and they both perform that task admirably.
There is something to be said for the historical value, and the longevity of the Camillus and Sheaffer. Who knows? The Kershaw and Visconti may be working generations after my body is dust in the ground, but I do enjoy using knives and pens that have been in the hands of others for several decades. The Sheaffer was purchased new by the grandfather of a friend of mine, and it is one of the finest writing pens I have ever used.
And there is that intangible aesthetic feel that accompanies the Camillus and Sheaffer when I use them that the Kershaw and Visconti simply cannot match. Nothing quite like holding old jigged bone in your hand while cutting, or an ebonite grip section while writing!
