Edit: I saw you added CAD software; I actually think that people would go back to just drawing things on paper before they'd go to "solar rig to PC with CAD software on it". Civilization did run just fine without computers up until they crashed the scene, and most of the really memorable buildings were designed on paper.
EDIT: I just realized, how many people will have blank paper in the apocalypse? How many people print anymore? Man this rabbit hole never ends… For heavens sake though, digital media is so anti-resilient that it’s just crazy…
Maybe keep a couple panels in your underground bunker to bring up to the surface after the blast…
Ammo, instant coffee, antibiotics. Cheap now, can keep for years, light weight and useful to everyone.
Seems like they'd matter more than the electronic number of a non-existent/inaccessible bank account of one's so-called wealth? But I agree that all such instantly barterable items are a better commodity.