I agree with not getting too hung up on labels as to BOB or whatever. My 'bob' I use for bugging in, its just a collection of gear that I use no matter what the situation.
I don't yet separate urban and rural gear, I want to redo my gear bag and make it modular so the urban stuff can be separated out. I have various electronic gear such as a scanner and cb radio which are handy for urban areas but not so much rural. I want to be able to separate that from my main pack so if we do have to abandon the BOV and hike by foot I can leave that weight there.